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: emotional status 
Words: down, melancholy, below, loveful, kind

Ex Output:
below


Ex Input:
Category: boxing terminology 
Words: deck, tko, box, glove, sail

Ex Output:
sail


Ex Input:
Category: bird 
Words: swallow, heron, crane, flamingo, tackle

Ex Output:

tackle