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:
plain, mansion, condominium, squashed, flat

Ex Output:
plain


Ex Input:
grasshopper, fly, walk, bus, eagle

Ex Output:
bus


Ex Input:
sprint, cow, duck, jog, squat

Ex Output:

cow