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:
ecstatic, specialty, substance, content, merchandise

Ex Output:
ecstatic


Ex Input:
neat, fine, classy, penalty, high quality

Ex Output:
penalty


Ex Input:
chocolate cake, mangle, smuggled, fudge, smear

Ex Output:

chocolate cake