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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.
Please use spoiler flag next time.
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It was written long time ago. Seems there were only string in input.
I liked this one.
State of the art answer.
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When I use your solution, I get false with the number 123321.