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A woman, dressed as a cardinal and wearing a hog mask, holds a banner while yelling slogans against the Catholic clergy outside the Metropolitan Cathedral in Mexico City

A woman, dressed as a cardinal and wearing a hog mask, holds a banner while yelling slogans against the Catholic clergy outside the Metropolitan Cathedral in Mexico City February 11, 2013. Pope Benedict stunned the Roman Catholic Church including his closest advisers on Monday when he announced he would stand down in the first papal abdication in 700 years, saying he no longer had the mental and physical strength to run the Church through a period of major crisis. REUTERS/Tomas Bravo (MEXICO - Tags: RELIGION POLITICS) - RTR3DNG3

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.