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: geographical property 
Words: paved, even, hill, level, flat

Ex Output:
even


Ex Input:
Category: secretary duty 
Words: file, organize, schedule appointments, answer calls, program

Ex Output:
program


Ex Input:
Category: type of sandwich 
Words: dance hall, burger, french toast, hero, club

Ex Output:

dance hall