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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.
OP solved the kata; issue not reproducible with his code.
Then I would suggest to read this article
Probably it is best if you stay away from tall building for a while. Getting into a lift might trigger a relapse.
The input can't be 13.
thx, but note that it's very bad, performances wise (the current top solution is blazing fast in comparison to this one)