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:
lower, backward, down, falling, shameful

Ex Output:
shameful


Ex Input:
cake, fudge, rich, invent, cream

Ex Output:
invent


Ex Input:
dally, waste away, fried, whittle, fritter

Ex Output:

fried