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: ice, air, fire, hire, combustion

Output: hire


Input: Consider Input: Category: poker 
Words: fold, deck, board, call, knockout

Output: knockout


Input: Consider Input: Category: boats 
Words: joker, rudder, dock, deck, sail


Output: joker