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Pope Francis greets journalists of the papal flight, upon arrival in Rio de Janeiro on July 22, 2013. Pope Francis landed in Brazil on Monday for his first overseas trip as pontiff to attend the international festival World Youth Day in Brazil, the world's biggest Catholic country. AFP PHOTO/LUCA ZENNARO/POOL RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO/LUCA ZENNARO/POOL" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS