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: physical property 
Words: protein, pasty, fat, thin, angular momentum

Ex Output:
protein


Ex Input:
Category: military rank 
Words: general, fighter, normal, major, lieutenant

Ex Output:
normal


Ex Input:
Category: nutritional value 
Words: absorption, vitamin c, fat, salt, sugar

Ex Output:

absorption