So a scan your post suggests you would be well served by using strict in your coding -- see Basic debugging checklist and Use strict warnings and diagnostics or die. If I'm reading it correctly, most of your return statements return barewords rather than strings. For example, I expect return K; should actually be return 'K'; -- you don't actually have a subroutine named K, right?
Of course, all this is guesses because your posted code is mangled because of lack of <code> tags and you don't provide input or expected output. See How do I post a question effectively?
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.
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Snippets of code should be wrapped in
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Want more info? How to link
or How to display code and escape characters
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