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:
bus, fly, swim, spider, flap

Ex Output:
spider


Ex Input:
output cord, fret, notes, frustrated, chord

Ex Output:
frustrated


Ex Input:
content, penalty, money, suspension, fine

Ex Output:

content