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    More than just that. The randomly generated cases include colons and and lots of other characters that we were definitely expecting as input.

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    When you read the instructions, janitormeir says "You can assume the array will always be valid, and there will always be one correct answer." He/she then decides to give a bunch of randomly created arrays as tests. Therefore my code has varying levels of success on different attempts because I'm assuming the instructions are actually correct. As far as I know, randomly generated arrays are random. Thus, either the instructions or the test cases should be changed.