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:
hiking, stingray, shark, fish, tiger

Ex Output:
hiking


Ex Input:
down, lower, opposite of up, ground, remorseful

Ex Output:
remorseful


Ex Input:
below, lower, down, downward, miserable

Ex Output:

miserable