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: chocolate food 
Words: rich, chocolate, fudge, chocolate cake, unwarranted

Ex Output:
unwarranted


Ex Input:
Category: social gathering 
Words: convention, club, discothek, hamburger, dance hall

Ex Output:
hamburger


Ex Input:
Category: type of rigidity 
Words: firm, tough, solid, hard, streamline

Ex Output:

streamline