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:
condominium, duplex, studio, flat, level

Ex Output:
level


Ex Input:
fire, blaze, water, flame, recruit

Ex Output:
recruit


Ex Input:
knifer, glass, woodwork, coating, panel

Ex Output:

knifer