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: fret, sad, amp, fingerpick, string
Example Output: sad

Example Input: emotional upsets, pick, emotional state, fret, emotional supports
Example Output: pick

Example Input: errands, fax, program, schedule, file
Example Output:
program