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: fat, ugly, sugar, salt, protein
Example Output: ugly

Example Input: jog, car, bike, bats, fly
Example Output: bats

Example Input: rigged, firm, unyielding, streamline, taut
Example Output:
streamline