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: computers 
Words: folder, document, file, image, correspondence

Ex Output:
correspondence


Ex Input:
Category: elements 
Words: ice, fire, burn, let go, combustion

Ex Output:
let go


Ex Input:
Category: ocean 
Words: up to the moment, tide, current, jetstream, brine

Ex Output:

up to the moment