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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.
"At comp": it is an error in your code. Print the input so you can see what happens.
PS: never say "it works on my IDE" because in your IDE you don't have all the real tests cases:-)