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: nutritional value 
Words: heavy, fat, protein, obese, carbs

Output: obese


Input: Consider Input: Category: bird 
Words: neck, heron, hummingbird, davit, crane


Output: davit