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:
club, hero, lettuce, bar, toast

Ex Output:
bar


Ex Input:
dump truck, hoist, crane, ostrich, goose

Ex Output:
dump truck


Ex Input:
flat, studio, duplex, valley, mansion

Ex Output:

valley