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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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While your statement is correct in practical situations, the task indicates that "All values will be positive integers or floats, or zero.", so this solution is enough to deal with the task.
Maybe the task could tell us what to do if the number input was <=0, but this is enough for the moment.
And that's what it says in the description: