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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.
Your solution probably isn't efficient enough. Some of the inputs can be quite large, like 20,000 characters or more.
Your code only checks if there is a "z" in the sentence.
Also, please mark your comment as spoiler if it contains code.