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

Example Input: even, size, fair, level, ok
Example Output: ok

Example Input: thing, merchandise, activity, content, sad
Example Output:
sad