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: stingray, horse, iguana, wrestle, fish

Output: wrestle


Input: Consider Input: Category: physical activity 
Words: bend, winter, fall, climb, exercise

Output: winter


Input: Consider Input: Category: direction 
Words: unhappy, downward, falling, sliding, down


Output: unhappy