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: animal 
Words: cockroach, leap, drive, swim, fly

Output: drive


Input: Consider Input: Category: boats 
Words: bridge, deck, stern, dock, suits

Output: suits


Input: Consider Input: Category: direction 
Words: down, kind, opposite of up, lower, ground


Output: kind