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:
fearful, content, substance, program, thing

Ex Output:
fearful


Ex Input:
clothing, tools, content, thing, fearful

Ex Output:

fearful