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:
brash, frank, bun, hot dog, grub

Ex Output:
brash


Ex Input:
knockout, blocking, crew, tko, deck

Ex Output:
crew


Ex Input:
ordinary, fighter, general, average, plain

Ex Output:

fighter