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: type of sandwich 
Words: submarine, burger, bar, lettuce, club
Example Output: bar

Example Input: Category: aesthetic characteristic 
Words: level, fair, milky, sunny, well
Example Output: sunny

Example Input: Category: body part 
Words: inch, head, foot, ear, finger
Example Output:
inch