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.

Ex Input:
Category: body part 
Words: elbow, foot, knee, inch, hand

Ex Output:
inch


Ex Input:
Category: type of sandwich 
Words: submarine, group, club, roll, grilled cheese

Ex Output:
group


Ex Input:
Category: aesthetic characteristic 
Words: fine, money, bright, neat, beautiful

Ex Output:

money