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: wispy, fine, probation, calm, prime

Ex Output:
calm


Ex Input:
Category: employment activity 
Words: recruit, replace, sack, heat, fire

Ex Output:
heat


Ex Input:
Category: emotional status 
Words: loveful, up, down, remorseful, melancholy

Ex Output:

up