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.

Ex Input:
format, sort mail, make coffee, order office supplies, file

Ex Output:
format

Ex Input:
duck, get down, fall, stoop, cow

Ex Output:
cow

Ex Input:
typical, fighter, ordinary, common, general

Ex Output:
fighter