main.c 9. Character Count by Jay Vince Serato Given a string of both uppercase and lowercase letters, print the most frequent letter or letters in the string in uppercase. Consider both letters in uppercase and lowercase as a single letter (i.e. the count of 'a' and 'A' is combined and treated the same). Input A string of varied length composed of uppercase and lowercase letters and spaces. A sample string Output The most frequent letter/s in the input. If there are more than one letter, print them alphabetically in new lines.

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