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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.
This is a new kind of task - you need to optimize server side code ^_^
You need to optimize your code
Just see the sample tests. devagx below asked the same.
That's not the input of a single test, that's the input of several tests one after the other, add a new line after printing the input.