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:
flyaway, penalty, prime, fine, comfortable

Ex Output:
comfortable


Ex Input:
tone, just, equitable, fair, unprejudiced

Ex Output:
tone


Ex Input:
detestings, blue, postponed, prompt, current

Ex Output:

blue