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: merchandise, excited, content, specialty, food
Example Output: excited

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

Example Input: postponed, delayed, wave, data sets, current
Example Output:
wave