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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.
Thank you very much, now that I can try and fix. I'll be amending my post to spoiler in the meantime.
This comment is hidden because it contains spoiler information about the solution
I can only imagine the reason being the way Java is converting the hyphen char to an int. If that's assuming a value of -1 for the -, it would be adding a 1 to the beginning of your returned string.