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:
centimeter, yard, foot, milimeter, head

Ex Output:
head

Ex Input:
merchandise, excited, content, specialty, food

Ex Output:
excited

Ex Input:
frank, brash, precise, cheese, harsh

Ex Output:
cheese