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: duplex, studio, cabin, horizontal, flat
Example Output: horizontal

Example Input: current, dastards, prompt, course, timely
Example Output: course

Example Input: tiger, hamster, cat, hunt, fish
Example Output:
hunt