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: soar, cockroach, walk, fly, run

Output: soar


Input: Consider Input: Category: elements 
Words: ice, fire, burn, let go, combustion

Output: let go


Input: Consider Input: Category: animal 
Words: ant, fly, fish, jog, bats


Output: jog