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: motherboard, schedule appointments, schedule, file, type
Example Output: motherboard

Example Input: crane, winch, mallet, winch, flamingo
Example Output: winch

Example Input: just, alright, ok, fair, size
Example Output:
size