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:
mad, beautiful, comfortable, fine, relaxed

Ex Output:
beautiful


Ex Input:
pie, fried, misuse, fritter, cake

Ex Output:
misuse


Ex Input:
iron, heavy, vitamin c, fat, brittleness

Ex Output:

brittleness