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:
parrot, goose, crane, swallow, excavator

Ex Output:
excavator


Ex Input:
stormy, fair, just, mild, brisk

Ex Output:
just


Ex Input:
downward, unhappy, down, shameful, disgusted

Ex Output:

downward