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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.
"Create a method to accept a single argument, an arbitrary input string, and return a string of length 26."
This sentence is confusing to read. I first thought it meant the method had to accept more than one argument. My suggestion:
"Create a method to accept one arbitrary string as an argument, and return a string of length 26."