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:
down, kind, ashamed, sliding, unhappy

Ex Output:
sliding


Ex Input:
signal, sea, current, drink, belated

Ex Output:
belated


Ex Input:
glide, car, bats, soar, fly

Ex Output:

bats