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: corporate 
Words: corporation, firm, synergy, tough, concerted

Output: tough


Input: Consider Input: Category: chocolate food 
Words: rich, chocolate, fudge, chocolate cake, unwarranted

Output: unwarranted


Input: Consider Input: Category: shady activities 
Words: rich, fix, fudge, lie, unlicensed


Output: rich