Loading collection data...
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.
Stop taking things so personally. Admit that the guy could do what you couldn't. And this solution isn't just math; the solution requires you to combine your coding skills with mathematical logic. Otherwise, in only "real life", we don't need to divide by nine and find the remainder; we can simply add all the numbers.