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:
ring, deck, pack, box, level

Ex Output:
pack


Ex Input:
unflappalbe, refreshing, funny, cool, confident

Ex Output:
refreshing


Ex Input:
lined, mountain, flat, cabin, elevation

Ex Output:

cabin