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:
townhome, mountain, studio, flat, apartment

Ex Output:
mountain


Ex Input:
frank, bold, brash, precise, pork

Ex Output:
pork


Ex Input:
joyful, food, content, item, specialty

Ex Output:

joyful