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:
ugly, absorption, vitamin c, fat, thin

Ex Output:
vitamin c


Ex Input:
replace, fire, retire, air, remove

Ex Output:
air


Ex Input:
wispy, fine, flyaway, prime, high quality

Ex Output:

high quality