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:
concerned, bored, emotional, fret, output cord

Ex Output:
output cord


Ex Input:
emotional supports, shameful, downward, loveful, down

Ex Output:
downward


Ex Input:
mountain, townhome, house, round, flat

Ex Output:

mountain