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: data sets, sea, prompt, timely, current
Example Output: sea

Example Input: down, kind, opposite of up, lower, ground
Example Output: kind

Example Input: fair, unprejudiced, light, fine, ok
Example Output:
light