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: concerned, strap lock, anxious, bored, fret
Example Output: strap lock

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

Example Input: honorable, fair, loyal, balanced, mild
Example Output:
mild