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:
current, dastards, prompt, course, timely

Ex Output:
course


Ex Input:
finger, heel, foot, ounce, elbow

Ex Output:
ounce


Ex Input:
fat, obese, iron, sugar, sugars

Ex Output:

obese