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:
vitamin c, salt, fat, big, absorption

Ex Output:
absorption


Ex Input:
fly, flutter, bus, drive, fish

Ex Output:
fish


Ex Input:
fret, neck, sad, jack, chord

Ex Output:

sad