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: centimeter, yard, foot, milimeter, head
Example Output: head

Example Input: alright, detached, fine, acceptable, bright
Example Output: bright

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