The Spelling Problem

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Fedya and Alex are OI-ers. They live in different cities, but they like to write letters to each other, in which they discuss complicated data structure problems, contests, nice girls/ boys, animes and other not so important things. Nevertheless, there is a problem, arising sometimes. Being quite young and impatient, Fedya is eager to send his just typed letter. Though everything is okay with it

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solution.cppC++17

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