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.

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

Output: let go


Input: Consider Input: Category: bird 
Words: dump truck, tackle, crane, hoist, davit

Output: dump truck


Input: Consider Input: Category: nutritional value 
Words: fat, bulky, calories, iron, sugars


Output: bulky