Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Example Input: dock, canvas, deck, blocking, caution
Example Output: dock

Example Input: closest, finished for the day, bordering, nearest, close
Example Output: finished for the day

Example Input: classy, arrest, there, beautiful, fine
Example Output:
arrest