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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.
If there are an equal number of naughty and nice it should return 'naughty'. In the example you provided there is 1 naughty ('broke...') and 1 nice ('got...') while the other 2 don't fit the pattern. Without seeing your code I can't offer suggestions but it worked for me in Ruby.
Language?
Also, are you sure you are not modifying the initial array?