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: fawn, social, cub, kid, colt
Example Output: social

Example Input: level, tone, fair, impartial, milky
Example Output: impartial

Example Input: left, emotional state, sad, emotional upsets, down
Example Output:
left