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

Example Input: fudge, molasses, cream, tart, banned
Example Output: banned

Example Input: pack, blocking, punch, apron, deck
Example Output:
pack