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: knockout, blocking, crew, tko, deck
Example Output: crew

Example Input: hamburger, club, discothek, lettuce, dagwood
Example Output: discothek

Example Input: loosen, smear, invent, fudge, pie
Example Output:
pie