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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.
It passes all tests until it throws an error and it doesn't keep running. There are more tests after that, 30 random tests in Python to be exact.
That error comes from your code, maybe
words
is an empty string there.tru submitting again(not a kata issue, site error which occurs once in a while)