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: fire, instruct, inferno, retire, scold
Example Output: inferno

Example Input: alright, size, dishonest, fine, fair
Example Output: size

Example Input: miserable, down, disgusted, melancholy, opposite of up
Example Output:
opposite of up