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:
dangle, fly, bee, bats, bike

Ex Output:
bike


Ex Input:
streamline, sustainability, private, firm, stiff

Ex Output:
stiff


Ex Input:
jail time, custody, alert, fine, prime

Ex Output:

alert