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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.
That algorithm works in javascript but not in python.
No problem.
I see you're new, it's not a kata issue, it's a problem with your code, use Question label for that, state the language you're using and show your code here, using markdown formatting and mark your post as having spoiler content.
Your functions should return the result, not print it, here in CW.