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: ban, fire, combustion, ground, flame

Output: ban


Input: Consider Input: Category: chocolate food 
Words: rich, molasses, fudge, brownies, wrongful

Output: wrongful


Input: Consider Input: Category: corporate 
Words: common, combined, tough, firm, corporation


Output: tough