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:
fret, angry, jack, nervous, emotionalities

Ex Output:
jack


Ex Input:
bike, flap, fly, walk, wave

Ex Output:
walk


Ex Input:
joker, deck, chips, apron, pack

Ex Output:

apron