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: window material 
Words: glass, coating, panel, spatula, lead

Ex Output:
spatula


Ex Input:
Category: chocolate food 
Words: replace, fudge, cupcake, heavy, cream

Ex Output:
replace


Ex Input:
Category: aesthetic characteristic 
Words: handsome, dull, flyaway, attractive, fine

Ex Output:

flyaway