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:
merchandise, excited, content, specialty, food

Ex Output:
excited


Ex Input:
fire, hire, heat, inferno, earth

Ex Output:
hire


Ex Input:
chord, fret, frustrated, strap lock, pick

Ex Output:

frustrated