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: poker 
Words: fold, queen, deck, galley, call

Ex Output:
galley


Ex Input:
Category: type of rigidity 
Words: solid, leverage, hard, unbending, firm

Ex Output:
leverage


Ex Input:
Category: direction 
Words: down, sad, south, opposite of up, backward

Ex Output:

sad