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: bird 
Words: crane, hoist, egret, tackle, ostrich

Ex Output:
hoist


Ex Input:
Category: aesthetic characteristic 
Words: mild, fair, texture, even, milky

Ex Output:
mild


Ex Input:
Category: elements 
Words: water, heat, fire, empower, cool

Ex Output:

empower