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    Paste your code, mark the post as having spoiler content.

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    moOse is the only string with 1 matching upper and lowercase letter--you have to disregard case.

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    the test string was mo0se, not moOse... try it again using copy/pasta

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    I tried running the code with same test input in my own complier seems working fine, however when i tried to run it here it always haas an error with moOse, something is wrong with the codewar's compiler.