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: employment activity 
Words: promote, ice, retire, ban, fire

Ex Output:
ice


Ex Input:
Category: type of sandwich 
Words: clan, lettuce, bacon, club, submarine

Ex Output:
clan


Ex Input:
Category: weather 
Words: clime, color, sunny, fair, luke

Ex Output:

color