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: well, milky, variety, tone, fair
Example Output: well

Example Input: Category: moral characteristic 
Words: windy, fair, just, ok, loyal
Example Output: windy

Example Input: Category: secretary duty 
Words: schedule appointments, errands, file, format, schedule
Example Output:
format