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: bird 
Words: winch, swift, crane, hoist, ostrich

Ex Output:
winch


Ex Input:
Category: nutritional value 
Words: iron, heavy, vitamin c, fat, brittleness

Ex Output:
brittleness


Ex Input:
Category: body part 
Words: finger, heel, foot, eye, pound

Ex Output:

pound