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: window material 
Words: glass, spyhole, handle, coating, knive

Ex Output:
knive


Ex Input:
Category: social gathering 
Words: group, clan, team, club, doorstep

Ex Output:
doorstep


Ex Input:
Category: chocolate food 
Words: falsehood, cookies, fudge, cream, molasses

Ex Output:

falsehood