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:
summer, roll, plummet, fall, exercise

Ex Output:
summer


Ex Input:
fret, angry, jack, nervous, emotionalities

Ex Output:
jack


Ex Input:
skinny, fat, chunky, obese, big

Ex Output:

big