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: dump truck, tackle, crane, duck, mallet
Example Output: dump truck

Example Input: fine, prime, arrest, hot, jail time
Example Output: hot

Example Input: eagle, fly, jump, bats, flap
Example Output:
flap