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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.
Again, print the input. If you don't know what it is, how can you say "this is the correct answer"?
Read this: https://docs.codewars.com/training/troubleshooting/#print-input
Print the input, the first value in the error message is what your function wrongly returned, the other is the expected value.