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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.
There was no internet in my childhood, but old book «Arithmetic for entertainment» by Yakov Perelman where I had read about some magic numbers like 2, 5, 9 etc. and had remembered their rules. Actually, any number-1 from its base has some magic.
Your code being wrong is not a kata issue, print the input.