Digit Sum

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Having watched the last Harry Potter film, little Gerald also decided to practice magic. He found in his father's magical book a spell that turns any number in the sum of its digits. At the moment Gerald learned that, he came across a number n. How many times can Gerald put a spell on it until the number becomes one-digit? ###Input: The first line contains the only integer $n$ .It is gua

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solution.cppC++17

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