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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.
This may just be my interpretation of the description of this Kata. It is quoted as saying "The given string can be assumed to contain only uppercase and lowercase alphabets." which sounds to me like they will only be letters, not numbers. However, my solution required me include numbers.