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: personal characteristic 
Words: assured, refreshing, unruffled, cool, positive

Output: refreshing


Input: Consider Input: Category: animal 
Words: swim, dive, fly, car, bee

Output: car


Input: Consider Input: Category: mode of transportation 
Words: fly, bus, beetle, flap, train


Output: beetle