Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Ex Input:
arrest, fine, ticket, beautiful, custody

Ex Output:
beautiful


Ex Input:
fearful, content, substance, program, thing

Ex Output:
fearful


Ex Input:
fudge, chocolate, heavy, rich, loosen

Ex Output:

loosen