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: boats 
Words: lifeline, stern, fold, deck, rudder

Output: fold


Input: Consider Input: Category: physical property 
Words: ugly, protein, large, heavy, fat

Output: protein


Input: Consider Input: Category: geographical property 
Words: level, flat, elevation, even, lined


Output: even