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:
level, smooth, flat, lined, elevation

Ex Output:
level


Ex Input:
tangle, fair, impartial, dishonest, balanced

Ex Output:
tangle


Ex Input:
ice, instruct, hire, scold, fire

Ex Output:

ice