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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.
Approved!
Fixed in this fork (also added random tests for negative numbers): https://www.codewars.com/kumite/62920ec01bd1bb8c8adaefb6?sel=62920ec01bd1bb8c8adaefb6
It seems the tests for this are broken, because input are not strings, but numbers. Language - Python.
I had to add conversion to str to make sure I got a string input (s = str(s)).