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: jog, jump, fish, fly, bats

Ex Output:
jog


Ex Input:
Category: emotional status 
Words: concerned, board, nervous, emotional, fret

Ex Output:
board


Ex Input:
Category: aesthetic characteristic 
Words: prison, exquisite, detailed, fine, high quality

Ex Output:

prison