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: direction 
Words: up, descending, down, lower, melancholy

Ex Output:
melancholy


Ex Input:
Category: type of sandwich 
Words: clan, lettuce, bacon, club, submarine

Ex Output:
clan


Ex Input:
Category: ocean 
Words: whirlpool, dastards, wave, current, brine

Ex Output:

dastards