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: bus, leap, spider, run, fly

Output: bus


Input: Consider Input: Category: activity 
Words: fried, spend, whittle, waste, fritter

Output: fried


Input: Consider Input: Category: aesthetic characteristic 
Words: attractive, fine, prison, level, detailed


Output: prison