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: measurement unit 
Words: ounce, ear, inch, foot, milimeter

Output: ear


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

Output: ban


Input: Consider Input: Category: corporate 
Words: corporation, stiff, firm, amalgamated, alignment


Output: stiff