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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.
If Python, then you need to check your code. There are many correct solutions.
Which language?
I don't think you understood the task correctly. Also, your log isn't helpful, unless you put the input that it corresponds to. (argument string)