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:
prime, penalty, fine, mad, arrest

Ex Output:
mad


Ex Input:
closest, finished for the day, bordering, nearest, close

Ex Output:
finished for the day


Ex Input:
hot, assured, positive, funny, cool

Ex Output:

hot