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: body part 
Words: heel, shin, pound, finger, foot

Ex Output:
pound


Ex Input:
Category: physical property 
Words: brittleness, large, fat, area, calcium

Ex Output:
calcium


Ex Input:
Category: widespread 
Words: average, plain, universal, lieutenant, general

Ex Output:

lieutenant