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:
firm, tough, solid, hard, streamline

Ex Output:
streamline


Ex Input:
fat, calories, vitamin c, absorption, carbs

Ex Output:
absorption


Ex Input:
meeting, clan, club, group, lettuce

Ex Output:

lettuce