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: down, backward, up, downward, shameful

Ex Output:
shameful


Ex Input:
Category: elements 
Words: pay, cool, combustion, air, fire

Ex Output:
pay


Ex Input:
Category: moral characteristic 
Words: unprejudiced, warm, fair, ok, balanced

Ex Output:

warm