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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.
i agree with that
So lets go even further and add that 1 to arr[0], since it is also guaranteed not to be in the result.
last lines should be:
s = int(s)
return s