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:
goodies, fortitude, frank, pork, weenie

Ex Output:
fortitude


Ex Input:
tiger, camp, cow, dog, fish

Ex Output:
camp


Ex Input:
lower, backward, down, falling, shameful

Ex Output:

shameful