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: animal 
Words: shark, dolphin, fish, hunting, cat

Ex Output:
hunting


Ex Input:
Category: emotional status 
Words: emotional, ground, ashamed, emotional upsets, down

Ex Output:
ground


Ex Input:
Category: physical activity 
Words: swan, crouch, hike, duck, squat

Ex Output:

swan