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: duck, get down, fall, stoop, cow
Example Output: cow

Example Input: ecstatic, content, disappointed, sad, service
Example Output: service

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