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: fly, swim, car, beetle, grasshopper
Example Output: car

Example Input: schedule, errands, file, schedule appointments, hardware
Example Output: hardware

Example Input: waggle, car, bird, leap, fly
Example Output:
car