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: flyaway, penalty, prime, fine, comfortable
Example Output: comfortable

Example Input: flap, glide, fly, train, bats
Example Output: bats

Example Input: ticket, fine, pretty, jail, suspension
Example Output:
pretty