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: physical property 
Words: obese, fat, vitamin c, heavy, thin

Output: vitamin c


Input: Consider Input: Category: elements 
Words: ground, replace, combustion, flame, fire

Output: replace


Input: Consider Input: Category: physical property 
Words: fat, absorption, ugly, pasty, iron


Output: iron