Panda loves Chocolates

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Po the Panda discovered a chocolate garden in the Valley of Peace. And he loves chocolates very much. But Master Shifu was not ready to give him chocolates so easily. He decided to give Po a string $S$ of letters $'L', 'R', 'U', 'D'$ denoting left, right, up, and down steps. It is assured that the steps form a closed loop where every point is traversed once except for the starting point which is

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solution.cppC++17

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