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: tone, just, equitable, fair, unprejudiced
Example Output: tone

Example Input: descending, remorseful, down, right, ground
Example Output: remorseful

Example Input: metal, glass, cup, fork, knifer
Example Output:
metal