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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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Your solution is good, but it seems incomplete. In my understanding, it was missing to validate 'if it is a positive integer'. You just filtered out the 'integers'
As the task is written in English, and my English is not the best, it was a little complicated to understand what was asked for, but after I understood it, it was really cool.