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: geographical property 
Words: paved, even, hill, level, flat

Ex Output:
even


Ex Input:
Category: police punishment 
Words: ticket, comfortable, prime, custody, fine

Ex Output:
comfortable


Ex Input:
Category: physical activity 
Words: duck, squat, goose, stoop, swim

Ex Output:

goose