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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.
The description is not clear at all about that but actually tests only provide strings entirely formed with lowercase letters (at least in Python and JS).
how do you make sure to count only lowercase letters with this logic?
I like the way you used ~~ instead of checking for undefined!