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:
goodies, weenie, blunt, wiener, frank

Ex Output:
blunt


Ex Input:
stingray, sea turtle, fish, cow, hiking

Ex Output:

hiking