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: jail, probation, fine, classy, firstrate
Example Output: classy

Example Input: climbing, cow, hiking, fish, wrestle
Example Output: cow

Example Input: file, type, image, format, space
Example Output:
type