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: boxing terminology 
Words: deck, tko, box, glove, sail

Ex Output:
sail


Ex Input:
Category: boats 
Words: crew, deck, rudder, suits, hull

Ex Output:
suits


Ex Input:
Category: bird 
Words: winch, neck, goose, crane, derrick

Ex Output:

winch