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:
signal, sea, current, drink, belated

Ex Output:
belated

Ex Input:
mallet, goose, geese, hike, duck

Ex Output:
hike

Ex Input:
high quality, ok, level, classy, fine

Ex Output:
ok