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:
order office supplies, file, errands, prepare, motherboard

Ex Output:
motherboard


Ex Input:
just, make the grade, well, unjust, fair

Ex Output:
make the grade


Ex Input:
area, obese, brittleness, heavy, fat

Ex Output:

heavy