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:
spring, run, fall, equinox, autumn

Ex Output:
run


Ex Input:
bored, amp, board, fret, truss rod

Ex Output:
bored


Ex Input:
frank, goodies, honest, cheese, hot dog

Ex Output:

honest