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:
ounce, foot, kilometer, milimeter, heel

Ex Output:
heel


Ex Input:
late, up to the moment, current, course, belated

Ex Output:
course


Ex Input:
gunwale, deck, punch, sail, bow

Ex Output:

punch