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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.
Are we talking about C++ here? The code I can see from you works. Also, the kata is in the list of your solved ones.
That's not the input your code is failing, print something besides the input value.