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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.
Test case wise, before submitting I was having issues with the random test cases involving E and 1 (specifically them switching places somehow) but I was unable to reproduce it in standard test cases. Running it trying to figure out what was wrong eventually passed all cases and led me to submit it. Maybe it's related to E being the key that returns '1'?