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    If the input string has any non-alpha characters, the function must return None, null, Nothing (depending on the language).

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    I write in Java but have some problem with test @testtes3t5(TestPigLatin)@
    My program fails on this test. So the input string is "tes3t5" ? if so then the right answer is es3t5tay which I return. What am I missing ?