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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.
The one in the expected message is your result, not the input. You failed at input
9876543210, which is already the biggest number that can be made.Not a kata issue.