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:
string, frustrated, chord, output cord, fret

Ex Output:
frustrated


Ex Input:
precise, integrity, frank, cheese, brash

Ex Output:
cheese


Ex Input:
blind, deck, rudder, bridge, dock

Ex Output:

blind