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, hire, heat, inferno, earth
Example Output: hire

Example Input: annoyed, fine, exquisite, alert, ok
Example Output: exquisite

Example Input: ecstatic, excited, content, activity, angry
Example Output:
activity