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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.
What if the input is negative? Looks as though the exit condition would never be met (e.g. squareDigits(-9119)) and it would loop forever.