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:
disgusted, up, below, downward, down

Ex Output:
disgusted


Ex Input:
tackle, davit, swift, crane, steam roller

Ex Output:
steam roller


Ex Input:
condominium, townhome, flat, level, even

Ex Output:

level