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:
sausage, matter of fact, frank, vittles, grub

Ex Output:
matter of fact

Ex Input:
concise, vittles, wiener, provision, frank

Ex Output:
concise

Ex Input:
foot, pound, ounce, shin, centimeter

Ex Output:
shin