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, salt, fat, big, absorption
Example Output: absorption

Example Input: plain, mansion, condominium, squashed, flat
Example Output: plain

Example Input: carbs, skinny, ugly, big boned, fat
Example Output:
carbs