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: trap, kayak, bat, climbing, fish
Example Output: bat

Example Input: pay, praise, fire, inferno, let go
Example Output: inferno

Example Input: happy, fine, firstrate, suspension, prime
Example Output:
happy