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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.
Really. Sorry
The initial input is 9876543201. My code returns 9876543210 which is correct, I suppose. But the test don't pass.
Python
9876543201 should equal -1. Why not 9876543210?