Loading collection data...
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.
The description seems inaccurate. It asks for a count of alphabetic characters, then differentiates between digits and alphabetic characters when describing the input, implying to not count duplicate digits. Not a big deal but this didn't seem very clear, when starting the problem I thought that was an imporant detail in the description.