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:
sea turtle, whale, dog, fish, hunting

Ex Output:
hunting

Ex Input:
angry, sad, fearful, content, item

Ex Output:
item