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:
vitamin c, carbs, fiber, fat, thin

Ex Output:
thin


Ex Input:
fine, classy, mad, happy, relaxed

Ex Output:
classy


Ex Input:
fish, kayak, cow, sea turtle, goat

Ex Output:

kayak