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: police punishment 
Words: hearing, firstrate, alert, custody, fine

Ex Output:
alert


Ex Input:
Category: physical activity 
Words: run, jump, autumn, fall, swim

Ex Output:
autumn


Ex Input:
Category: physical property 
Words: heavy, fat, thin, pasty, big

Ex Output:

big