Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Example Input: Category: aesthetic characteristic 
Words: luke, fair, variety, tone, well
Example Output: luke

Example Input: Category: social gathering 
Words: picnic, french toast, clan, club, bar
Example Output: french toast

Example Input: Category: window material 
Words: handle, fork, glass, panel, fiberglass
Example Output:
fork