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:
blue, wave, current, timely, drink

Ex Output:
timely


Ex Input:
fall, cold, plummet, plunge, exercise

Ex Output:

cold