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: direction 
Words: kind, descending, down, opposite of up, flat

Ex Output:
kind


Ex Input:
Category: window material 
Words: glass, spyhole, handle, coating, knive

Ex Output:
knive


Ex Input:
Category: aesthetic characteristic 
Words: fine, attractive, bright, high quality, firstrate

Ex Output:

firstrate