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: pounce, car, bats, fly, grasshopper
Example Output: car

Example Input: climbing, cow, hiking, fish, wrestle
Example Output: cow

Example Input: penalty, comfortable, fine, alert, alright
Example Output:
penalty