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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.
Very nice solution! Instead of checking for what letters the sentence does contain, you checked for the first occurence where the sentence does not contain one of the 26 letters (looping over 26 letters as opposed to the sentence).
I was thinking that as well! String.contains() method takes CharSequence as an input, so having only a single character c will throw you an error.