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: delayed, brine, belated, current, postponed
Example Output: brine

Example Input: order office supplies, sort mail, file, program, type
Example Output: program

Example Input: meeting, cinema, club, group, submarine
Example Output:
submarine