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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.
In some cases there comes this kind of error when making TRY-testing. It's random, so I believe test cases are not consistent.
How would it work if an input string contains a lot of spaces (first len(s)>140 check would give false positive)?
Not gonna work (index out of bound error) if there comes any capital letter after index(Z)-13.