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: equitable, just, fair, loyal, even
Example Output: even

Example Input: foot, knee, eye, leg, ounce
Example Output: ounce

Example Input: backward, melancholy, up, down, south
Example Output:
melancholy