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: fish, bat, mice, dog, hiking
Example Output: hiking

Example Input: down, kind, opposite of up, lower, ground
Example Output: kind

Example Input: dangle, flap, leap, eagle, fly
Example Output:
flap