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:
format, image, fax, file, folder

Ex Output:
fax


Ex Input:
clothing, content, service, substance, ecstatic

Ex Output:
ecstatic


Ex Input:
push, duck, mallet, crouch, dodge

Ex Output:

mallet