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: shady activities 
Words: falsification, fib, invent, fudge, cupcake

Ex Output:
cupcake


Ex Input:
Category: elements 
Words: fire, retire, ice, air, earth

Ex Output:
retire


Ex Input:
Category: nutritional value 
Words: fat, obese, iron, sugar, sugars

Ex Output:

obese