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, fire, burn, let go, combustion

Output: let go


Input: Consider Input: Category: outdoor sport activity 
Words: hike, cow, trap, row, fish

Output: cow


Input: Consider Input: Category: activity 
Words: fritter, pie, dally, blow, spend


Output: pie