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:
fly, swim, car, beetle, grasshopper

Ex Output:
car


Ex Input:
fine, prime, firstrate, custody, ok

Ex Output:
ok


Ex Input:
errands, fax, file, type, ram

Ex Output:

ram