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: cards, deck, suits, box, fold
Example Output: box

Example Input: ecstatic, specialty, substance, content, merchandise
Example Output: ecstatic

Example Input: big boned, ugly, fat, heavy, heavy
Example Output:
heavy