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: nutritional value 
Words: vitamin c, salt, sugar, fat, big boned

Ex Output:
big boned


Ex Input:
Category: weather 
Words: brisk, ghostly, windy, fair, deal

Ex Output:
ghostly


Ex Input:
Category: animal 
Words: run, walk, beetle, fly, drive

Ex Output:

drive