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:
bowl, plastic, glass, panel, lead

Ex Output:
bowl


Ex Input:
backward, south, down, forward, shameful

Ex Output:
shameful


Ex Input:
car, cockroach, bats, fly, fish

Ex Output:

car