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:
level, smooth, flat, lined, elevation

Ex Output:
level


Ex Input:
vittles, integrity, cheese, pork, frank

Ex Output:
integrity


Ex Input:
hearing, there, beautiful, fine, attractive

Ex Output:

hearing