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    This comment is hidden because it contains spoiler information about the solution

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    The problem is that you should first of all check to see if the sequence is invalid (=has invalid characters); one of the text cases deliberately give you something like '____' just to test that.

    I am not the one who wrote the Python version, but basically any version works that way on purpose.

    I hope that was clear enough and the issue can be considered fixed :)