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: aesthetic characteristic 
Words: high quality, ok, level, classy, fine

Ex Output:
ok


Ex Input:
Category: chocolate food 
Words: fudge, cream, replace, cookies, brownies

Ex Output:
replace


Ex Input:
Category: chocolate food 
Words: invent, fudge, chocolate, truffles, brownie

Ex Output:

invent