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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.
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The input is a list of non-negative integers and strings only. Input validation is not required then.
I think this is the closest I've come across with one exception; it doesn't check for negative numbers.
Then again, the tests don't check for it either. This is mostly a problem with the description not matching what's tested.