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: baby animals 
Words: buck, bambi, lust, fawn, deer

Ex Output:
lust


Ex Input:
Category: boats 
Words: head, hull, knockout, deck, dock

Ex Output:
knockout


Ex Input:
Category: bird 
Words: winch, swallow, winch, crane, parrot

Ex Output:

winch