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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.
Your code is wrong. See the input format:
It is a list of tuples. So, data[0] is a tuple, and you can't use
>=as the error says. And the output should be a list of strings. The kata is fine, your code is not. Please read this: https://docs.codewars.com/training/troubleshooting