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:
climbing, cow, hiking, fish, wrestle

Ex Output:
cow


Ex Input:
fair, even, milky, ghostly, luke

Ex Output:
luke


Ex Input:
hardware, firewall, file, format, order office supplies

Ex Output:

order office supplies