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.

Ex Input:
Category: police punishment 
Words: jail, fine, bright, arrest, flyaway

Ex Output:
bright


Ex Input:
Category: nutritional value 
Words: heavy, fat, protein, obese, carbs

Ex Output:
obese


Ex Input:
Category: direction 
Words: ground, opposite of up, emotional, down, sliding

Ex Output:

emotional