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.

Input: Consider Input: sausage, matter of fact, frank, vittles, grub

Output: matter of fact


Input: Consider Input: file, keys, organize, errands, correspondence

Output: keys


Input: Consider Input: doughnut, fritter, waste, seperate, blow


Output: doughnut