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: boxing terminology 
Words: deck, ring, head, knockout, glove

Ex Output:
head


Ex Input:
Category: type of sandwich 
Words: picnic, open-faced, club, grilled cheese, lettuce

Ex Output:
picnic


Ex Input:
Category: emotional status 
Words: fine, well, alright, content, penalty

Ex Output:

penalty