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: train, fly, jump, leap, grasshopper

Output: train


Input: Consider Input: Category: elements 
Words: fire, retire, ice, air, earth

Output: retire


Input: Consider Input: Category: aesthetic characteristic 
Words: hot, there, detailed, fine, probation


Output: probation