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.
Oh, thank you for pointing that out!
Why don't you check whether a character is digit or alphabetic?
Maybe, tests don't consider this case or I just don't understand something obvious...
This comment is hidden because it contains spoiler information about the solution