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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.
This kata is too easy. Developer without practical experience (first semester of studies) will do this.
I think it can be harder, if test cases includes numbers, where answer can be greater than long, or long long. Then, you have much harder case.
Nice try ;)