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.

Example Input: group, clan, hamburger, club, bar
Example Output: hamburger

Example Input: vitamin c, carbs, fiber, fat, thin
Example Output: thin

Example Input: courage, entree, precise, blunt, frank
Example Output:
entree