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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.
Don't feel bad, everyone has to learn at some point, check the sample tests about how the input/output is formatted. Don't use a global var, use your function argument.
Because your code is wrong and it doesn't take a number as input, also, it should return the result.