3120. Count the Number of Special Characters I

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You are given a string word. A letter is called special if it appears both in lowercase and uppercase in word. Return the number of special letters in word. Example 1: Input: word = "aaAbcBC" Output: 3 Explanation: The special characters in word are 'a', 'b', and 'c'. Example 2: Input: word = "abc" Output: 0 Explanation: No character in word appears in uppercase. Example 3: Input: w

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solution.cppC++17

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