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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
That's weird... Maybe it means that the tests are not sufficient enough. Or maybe your code was on the edge of being fast enough.
You provided no language, no information, no test cases, no explanations, just the old classic "it runs perfect on my machine".
No, your code is simply wrong. And because you didn't care to elaborate, that's all I can conclude. This is not a KATA issue, but an issue with your code ( = question )
Try to print the input in whatever language you're using and track where it goes wrong ( also: READ THE ERROR MESSAGES! ). If you're still stuck, please open with a new question, and more information :P