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:
regular, general, captain, ubiquitous, popular

Ex Output:
captain


Ex Input:
ounce, foot, kilometer, milimeter, heel

Ex Output:
heel


Ex Input:
smuggled, heavy, fudge, falsehood, fix

Ex Output:

heavy