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: pay, cool, combustion, air, fire

Output: pay


Input: Consider Input: Category: activity 
Words: fritter, waste, pie, waste away, lollygag

Output: pie


Input: Consider Input: Category: outdoor sport activity 
Words: climbing, fish, row, shark, raft


Output: shark