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: elements 
Words: let go, flame, inferno, fire, water

Ex Output:
let go


Ex Input:
Category: outdoor sport activity 
Words: fish, hiking, row, shark, canoe

Ex Output:
shark


Ex Input:
Category: boxing terminology 
Words: joker, blocking, deck, corner, glove

Ex Output:

joker