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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.
You just need to check the type of your value. (With typeof variableName)
Maybe you send 5 (but is a string) and the exercice need a 5 (int).
Not sure how to help you without more information. Is your function returning a string for some reason?
Which language did you solve it in? I only did Java the other translations are from other users.