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: recruit, replace, sack, heat, fire

Ex Output:
heat


Ex Input:
Category: direction 
Words: below, backward, melancholy, down, ground

Ex Output:
melancholy


Ex Input:
Category: consumer product 
Words: excited, activity, content, item, shop

Ex Output:

excited