Welcome to Quark 23

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The organizers of Quark'23 want to buy a gift for the top participant. They know a shop that has a variety of unique gifts. They choose one of the gifts, but the price tag is missing. To decide the selling price of the gift, the shopkeeper gives them a task to solve. The name of the gift is a string $S$ consisting of lowercase English letters. The shopkeeper promises to sell the gift to the organ

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solution.cppC++17

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