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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.
Are you returning what is asked? (re-read the signature of the function).
In Python you can use [-1] as the index to a list to access the first item from the right.
sorry for the noob question, but why access items from the -1 index?? wouldn't that give an out of bounds exception?