In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Input: Consider Input: nXVXIEGP, fkXIEkU

Output: XIE


Input: Consider Input: bVlwKYBYmcNq, hBlwKYBprL

Output: lwKYB


Input: Consider Input: UbOCpOr, GZOCpbv


Output: OCp