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:
angry, joyful, tools, fearful, content

Ex Output:
tools

Ex Input:
pale, windy, fair, flaxen, light

Ex Output:
windy

Ex Input:
flat, squashed, even, smooth, studio

Ex Output:
smooth