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:
file, keys, organize, errands, correspondence

Ex Output:
keys


Ex Input:
comfortable, money, fine, prison, jail time

Ex Output:
comfortable


Ex Input:
light, texture, fair, pale, sunny

Ex Output:

sunny