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: outdoor sport activity 
Words: dog, swim, hike, hiking, fish

Ex Output:
dog


Ex Input:
Category: emotional status 
Words: annoyed, level, alright, happy, fine

Ex Output:

level