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: animal 
Words: hamster, mice, fish, tiger, row

Ex Output:
row


Ex Input:
Category: nutritional value 
Words: sugar, calories, iron, fat, area

Ex Output:
area


Ex Input:
Category: nutritional value 
Words: sugar, calories, iron, fat, area

Ex Output:

area