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: group, blt, french toast, hamburger, club
Example Output: group

Example Input: deck, knockout, bow, sail, rudder
Example Output: knockout

Example Input: recruit, fire, burn, blaze, cool
Example Output:
recruit