Students and contract teachers on strike push to pass a police blockade in front of the Greek parliament in Athens on January 17, 2019 during a rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Students and contract teachers on strike push to pass a police blockade in front of the Greek parliament in Athens on January 17, 2019 during a rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Students and contract teachers on strike push to pass a police blockade in front of the Greek parliament in Athens on January 17, 2019 during a rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Students and contract teachers on strike push to pass a police blockade in front of the Greek parliament in Athens on January 17, 2019 during a rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Students and contract teachers on strike push to pass a police blockade in front of the Greek parliament in Athens on January 17, 2019 during a rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Students and contract teachers on strike push to pass a police blockade in front of the Greek parliament in Athens on January 17, 2019 during a rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Students and contract teachers on strike push to pass a police blockade in front of the Greek parliament in Athens on January 17, 2019 during a rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

A teacher shouts slogans during a demonstration in Athens on January 17, 2019 to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Teachers shout slogans during a demonstration in Athens on January 17, 2019 to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Teachers shout slogans during a demonstration in Athens on January 17, 2019 to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Teachers shout slogans during a demonstration in Athens on January 17, 2019 to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Teachers march during a demonstration in Athens on January 17, 2019 to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Teachers shout slogans during a demonstration in Athens on January 17, 2019 to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

Teachers shout slogans during a demonstration in Athens on January 17, 2019 to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. - The education ministry is preparing to push through parliament a hiring law which teacher unions say does not sufficiently take prior experience into account. Greece's public schools have suffered from spending cuts imposed as a condition of bailout agreements to end its debt crisis. (Photo by Aris MESSINIS / AFP)

17 January 2019, Greece, Athen: Students and teachers come into conflict with riot police during a demonstration in front of the Greek parliament. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

17 January 2019, Greece, Athen: Students and teachers come into conflict with riot police during a demonstration in front of the Greek parliament. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

17 January 2019, Greece, Athen: Students and teachers shout slogans during a demonstration in front of the Greek Parliament. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

17 January 2019, Greece, Athen: Students and teachers shout slogans during a demonstration in front of the Greek Parliament. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

17 January 2019, Greece, Athen: Riot police are standing in front of the Greek Parliament during a demonstration. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

17 January 2019, Greece, Athen: Students and teachers come into conflict with riot police during a demonstration in front of the Greek parliament. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

17 January 2019, Greece, Athen: Students and teachers come into conflict with riot police during a demonstration in front of the Greek parliament. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

17 January 2019, Greece, Athen: Students and teachers come into conflict with riot police during a demonstration in front of the Greek parliament. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

17 January 2019, Greece, Athen: Students and teachers come into conflict with riot police during a demonstration in front of the Greek parliament. The public sector is on strike for one day. The strikers are demanding the withdrawal of a law that changes the way teachers are appointed to the public school system in Greece. Photo: Socrates Baltagiannis/dpa

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM

ATHENS, GREECE - JANUARY 17: Contract teachers stage a demonstration to call for the withdrawal of a legislation which changes the way educators are appointed in the public school system, at Syntagma Square in Athens, Greece, on 17 January 2019. Ayhan Mehmet / Anadolu Agency/ABACAPRESS.COM