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:
duplex, studio, flat, paved, squashed

Ex Output:
paved


Ex Input:
order office supplies, sort mail, file, program, type

Ex Output:
program


Ex Input:
backward, down, remorseful, lower, opposite of up

Ex Output:

remorseful