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

Example Input: ashamed, down, emotional upsets, disgusted, ground
Example Output: ground

Example Input: heavy, brittleness, sugar, fat, skinny
Example Output:
sugar