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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.
It's a question, not an issue. Issues are for problems in the kata, not in your code.
In "Sample tests" and "Attempt" the 1st test is not necessarily the same (print the input). Since you have assed the kata look at the tests.