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: ocean 
Words: current, data sets, main, sea, wave

Ex Output:
data sets


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

Ex Output:
let go


Ex Input:
Category: nutritional value 
Words: fiber, salt, protein, fat, chunky

Ex Output:

chunky