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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.
Then wouldn't "h" be a valid input? --> "#H". I guess single char is not a "word"
This is a very poorly worded excercise. Someone needs to refactor the problem statement to make it more clear and remove the bad English mistakes!