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: ring, deck, blind, cards, joker

Ex Output:
ring


Ex Input:
Category: elements 
Words: ground, replace, combustion, flame, fire

Ex Output:
replace


Ex Input:
Category: computers 
Words: software, file, document, folder, reception

Ex Output:

reception