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: hummingbird, tackle, crane, hoist, tackle

Ex Output:
tackle


Ex Input:
Category: location (proximity) 
Words: beside, close, steady, nearest, nearer

Ex Output:
steady


Ex Input:
Category: physical activity 
Words: cold, plummet, fall, jump, plunge

Ex Output:

cold