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: weather 
Words: windy, stormy, fair, tone, tangle

Ex Output:
tone


Ex Input:
Category: personal characteristic 
Words: assured, refreshing, unruffled, cool, positive

Ex Output:
refreshing


Ex Input:
Category: bird 
Words: hoist, goose, pelican, crane, neck

Ex Output:

hoist