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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.
Poetic description is nice, but too vague. Got it working according to description, but all tests here failed. I thought you want to find the longest string by letter from array, not the letters that appear the most in ALL strings. To me that is not spaghetti, but macaroni...
What happens if input is -1. Or did I understood this kata wrong...