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:
acceptable, mad, fine, comfortable, probation

Ex Output:
probation


Ex Input:
bats, pounce, cockroach, bike, fly

Ex Output:
bike


Ex Input:
bun, honest, vittles, goodies, frank

Ex Output:

honest