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: weather 
Words: raining, sunny, fair, ghostly, windy

Ex Output:
ghostly


Ex Input:
Category: emotional status 
Words: acceptable, mad, fine, comfortable, probation

Ex Output:

probation