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: windlass, excavator, crane, hummingbird, steam roller
Example Output: hummingbird

Example Input: plate, glass, fiberglass, translucent fabric, coating
Example Output:
plate