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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.
I like this. Thanks :)
You don't have to declare the type of read s, as it is given by the function type signature.
As far as I know, this solution doesn't work for input strings where characters aren't unique, e.g. "banana" and "atana". The right solution using intersections is, in my opinion, the Bodigrim's.