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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.
From the description, it is not expected to. but yeah it doesn't.
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The description states that each word has a single number from 1 to 9. They never have two digit ones.
Even if it solves this kata and is upvoted as hell, is does not work with two digit numbers ;)
Those short solutions have a downside, two digit numbers, throws an error.