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Mandatory Credit: Photo by AGF s.r.l./REX (3535602b) Street art depicts Pope Francis as Superman, Rome, Italy - 29 Jan 2014 Street art depicting P...

Mandatory Credit: Photo by AGF s.r.l./REX (3535602d) Street art depicts Pope Francis as Superman, Rome, Italy - 29 Jan 2014 Street art depicting P...

Pope Francis greets the crowd during a general audience at St Peter's square on January 29, 2014 at the Vatican. AFP PHOTO / ALBERTO PIZZOLI

Pope Francis greets the crowd during a general audience at St Peter's square on January 29, 2014 at the Vatican. AFP PHOTO / ALBERTO PIZZOLI

Pope Francis receives a flag thrown by a pilgrim during a general audience at St Peter's square on January 29, 2014 at the Vatican. AFP PHOTO / ALBER...

Pope Francis holds a parrot shown by a pilgrim as he arrives for his general audience at St Peter's square on January 29, 2014 at the Vatican. AFP PH...

Ukraine, Kyiv, 28 January 2014 Anti-rioting forces face off with pro-EU protesters, in the Parliament Park, outside the Dynamo stadium. Ukraine, Kiev...

Pope Francis delivers his message during the Angelus prayer he celebrated from the window of his studio overlooking St. Peter's Square, at the Vatican...

Pope Francis looks at two children as they free doves during the Angelus prayer he celebrated from the window of his studio overlooking St. Peter's Sq...

Pope Francis delivers his message during the Angelus prayer he celebrated from the window of his studio overlooking St. Peter's Square, at the Vatican...

Pope Francis waves to the crowd from the window of his private apartments during his sunday's Angelus prayer at St Peter's square on January 26, 2014...

Pope Francis waves to the crowd from the window of his private apartments during his sunday's Angelus prayer at St Peter's square on January 26, 2014...

Pope Francis waves to the crowd from the window of his private apartments during his sunday's Angelus prayer at St Peter's square on January 26, 2014...

Pope Francis blesses the crowd from the window of his private apartments during his sunday's Angelus prayer at St Peter's square on January 26, 2014 a...

Young people release white doves next to Pope Francis from the window of his private apartments during his sunday's Angelus prayer at St Peter's squar...

Young people release white doves next to Pope Francis from the window of his private apartments during his sunday's Angelus prayer at St Peter's squar...

Children release white doves next to Pope Francis from the window of his private apartments during his sunday's Angelus prayer at St Peter's square on...

Children release white doves next to Pope Francis from the window of his private apartments during his sunday's Angelus prayer at St Peter's square on...

A young girl stands by Pope Francis as he addresses the crowd from the window of his private apartments during his sunday's Angelus prayer at St Peter...

This handout picture released on January 26, 2014 by the Vatican press office shows Pope Francis kissing a young girl after she releases a white dove...

Pope Francis, flanked by a boy and a girl of the Rome's Azione Cattolica, frees two doves as he delivers his Angelus blessing from the window of his p...

Pope Francis, flanked by a boy and a girl of the Rome's Azione Cattolica, frees two doves as he delivers his Angelus blessing from the window of his p...

Ukraine, Kyiv, 25 January 2014 Hrushevskoho street. Pro-EU barricades at the Dynamo stadium entrance. Ukraine, Kiev, 25 janvier 2014 Rue Hrushevskoho...

Pope Francis presides over a Vespers ceremony at Rome's St. Paul Basilica, at the Vatican, Saturday, Jan. 25, 2014. (AP Photo/Andrew Medichini)

Pope Francis presides over a Vespers ceremony at Rome's St. Paul Basilica, at the Vatican, Saturday, Jan. 25, 2014. (AP Photo/Andrew Medichini)

Pope Francis arrives to preside over a Vespers ceremony at Rome's St. Paul Basilica, at the Vatican, Saturday, Jan. 25, 2014. (AP Photo/Andrew Medichi...

Pope Francis arrives to preside over a Vespers ceremony at Rome's St. Paul Basilica, at the Vatican, Saturday, Jan. 25, 2014. (AP Photo/Andrew Medichi...

Pope Francis presides over a Vespers ceremony at Rome's St. Paul Basilica, at the Vatican, Saturday, Jan. 25, 2014. (AP Photo/Andrew Medichini)

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis leads the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP PHOTO / TIZIANA FABI

Pope Francis removes his miter at the end of the vespers on January 25, 2014 at the Basilica of Saint Paul Outside the Walls (San Paolo Basilica). AFP...

Mandatory Credit: Photo by AGF s.r.l./REX (3529620a) Pope Francis and French President Francois Hollande Pope Francis receives French President Fran...

Mandatory Credit: Photo by AGF s.r.l./REX (3529620f) Pope Francis and French President Francois Hollande Pope Francis receives French President Fran...

Mandatory Credit: Photo by AGF s.r.l./REX (3529620c) Pope Francis and French President Francois Hollande Pope Francis receives French President Fran...

Mandatory Credit: Photo by AGF s.r.l./REX (3529620e) Pope Francis and French President Francois Hollande Pope Francis receives French President Fran...

Mandatory Credit: Photo by AGF s.r.l./REX (3529620g) Pope Francis and French President Francois Hollande Pope Francis receives French President Fran...

French President Francois Hollande, left, is welcomed bY Pope Francis on the occasion of their private audience at the Vatican, Friday, Jan. 24, 2014....

In this photo provided by the Vatican newspaper L'Osservatore Romano, Pope Francis and French President Francois Hollande shake hands during their pri...

In this photo provided by the Vatican newspaper L'Osservatore Romano, Pope Francis and French President Francois Hollande shake hands during their pri...