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A reveller dressed like the Pope holds a sign while joking with other revellers from the Sergeant Pepper's Carnival block in Rio de Janeiro

A reveller dressed like the Pope holds a sign while joking with other revellers from the Sergeant Pepper's Carnival block in Rio de Janeiro, February 11, 2013. REUTERS/Ana Carolina Fernandes (BRAZIL - Tags: SOCIETY RELIGION) - RTR3DNS6

World reacts to Pope's resignation

Pope Benedict left the Catholic world in shock after becoming the first pontiff since the Middle Ages to resign his office, saying that failing strength had left him unable to lead the church through a period of relentless change and turmoil.