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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.
That was my first solution, but it does not consider input validation according to description:
"... accepts a string containing up to 26 unique alphabetical characters."