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: social gathering 
Words: convention, club, discothek, hamburger, dance hall

Output: hamburger


Input: Consider Input: Category: physical property 
Words: bulky, skinny, carbs, absorption, fat

Output: carbs


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


Output: dump truck