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: weather 
Words: cold, luke, fair, mild, light

Ex Output:
light


Ex Input:
Category: physical property 
Words: brittleness, protein, bulky, skinny, fat

Ex Output:
protein


Ex Input:
Category: window material 
Words: plate, glass, fiberglass, translucent fabric, coating

Ex Output:

plate