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:
brash, frank, bun, hot dog, grub

Ex Output:
brash


Ex Input:
ecstatic, content, disappointed, sad, service

Ex Output:
service


Ex Input:
general, admiral, ubiquitous, fighter, sergeant

Ex Output:

ubiquitous