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

Ex Output:
remorseful


Ex Input:
leverage, solid, firm, amalgamated, concerted

Ex Output:
solid


Ex Input:
arm, hand, foot, leg, centimeter

Ex Output:

centimeter