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: sergeant, general, standard, plain, ordinary
Example Output: sergeant

Example Input: milky, fair, well, alright, impartial
Example Output: milky

Example Input: crane, winch, excavator, steam roller, tackle
Example Output:
winch