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: clothing, content, service, substance, ecstatic
Example Output: ecstatic

Example Input: trustworthy, well, fair, loyal, stormy
Example Output: stormy

Example Input: classy, popular, mild, cool, funny
Example Output:
mild