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: falsification, banned, mangle, chocolate cake, fudge
Example Output: chocolate cake

Example Input: club, hero, lettuce, bar, toast
Example Output: bar

Example Input: unhappy, backward, flat, down, up
Example Output:
unhappy