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: emotional status 
Words: merchandise, angry, ecstatic, content, joyful

Ex Output:
merchandise


Ex Input:
Category: employment activity 
Words: fire, hire, ground, pay, retire

Ex Output:
ground


Ex Input:
Category: police punishment 
Words: hearing, firstrate, alert, custody, fine

Ex Output:

alert