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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.
No problem, and I know it's not very intuitive, just mark your post as having spoiler content when posting code or explaining a solution, simple comments like that are just fine.
Mark your post as having spoiler content next time, please. Otherwise, it's visible in the homepage.
About his/her code, the input only contains letters in it, so your input value isn't valid.