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: corporate 
Words: unyielding, concerted, firm, combined, united

Ex Output:
unyielding


Ex Input:
Category: consumer product 
Words: merchandise, happy, thing, content, service

Ex Output:
happy


Ex Input:
Category: emotional status 
Words: content, fine, relaxed, happy, suspension

Ex Output:

suspension