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:
group, clan, hamburger, club, bar

Ex Output:
hamburger


Ex Input:
big boned, vitamin c, fiber, sugar, fat

Ex Output:
big boned


Ex Input:
knive, acrylic, vinyl, glass, wood

Ex Output:

knive