AI Word Correction

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$Mr.Hannibal$ is a Software Engineer, with specialization in Artificial Intelligence. He is really annoyed by the words that have a mix of **Upper and Lower case characters**. Thus he wanted to build a software that would change the letters' register in every word so that it either **only** consists of lowercase letters or, vice versa, only of uppercase ones. Mr.Hannibal also wants to make sure

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solution.cppC++17

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