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Adelina Hidalgo holds a photograph of Pope Benedict as she kneels inside the Metropolitan Cathedral in San Salvador

Adelina Hidalgo holds a photograph of Pope Benedict as she kneels inside the Metropolitan Cathedral in San Salvador February 11, 2013. Pope Benedict said on Monday he will resign on February 28 because he no longer has the strength to fulfil the duties of his office, becoming the first pontiff since the Middle Ages to take such a step. REUTERS/Ulises Rodriguez (EL SALVADOR - Tags: RELIGION POLITICS TPX IMAGES OF THE DAY) - RTR3DN6Y

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.