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: nutritional value 
Words: vitamin c, salt, sugar, fat, big boned

Ex Output:
big boned


Ex Input:
Category: boats 
Words: check, stern, hull, galley, deck

Ex Output:
check


Ex Input:
Category: window material 
Words: glass, acrylic, wood, coating, cup

Ex Output:

cup