2047. Number of Valid Words in a Sentence

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A sentence consists of lowercase letters ('a' to 'z'), digits ('0' to '9'), hyphens ('-'), punctuation marks ('!', '.', and ','), and spaces (' ') only. Each sentence can be broken down into one or more tokens separated by one or more spaces ' '. A token is a valid word if all three of the following are true: - It only contains lowercase letters, hyphens, and/or punctuation (no digits). - There

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solution.cppC++17

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