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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.
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I tend to deal with the given integer by converting it to a string and divide the string into several chars.However, I find it a trifle difficult to deal with minus integers.