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: level, impartial, fair, tone, cool
Example Output: impartial

Example Input: ok, neat, fine, attractive, beautiful
Example Output: ok

Example Input: blow, waste away, fritter, dally, croquet
Example Output:
croquet