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:
air, fire, hire, ban, promote

Ex Output:
air


Ex Input:
flat, level, mansion, smooshed, elevation

Ex Output:
mansion


Ex Input:
bordering, gated, neighboring, touching, close

Ex Output:

gated