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:
level, tone, fair, impartial, milky

Ex Output:
impartial


Ex Input:
fine, level, pretty, mad, detailed

Ex Output:
mad


Ex Input:
alignment, inflexible, leverage, sustainability, firm

Ex Output:

inflexible