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

Input: Consider Input: sJRFPufsaWXNeu, AePufsafc

Output: Pufsa


Input: Consider Input: pySBCdpe, AEBCdOR

Output: BCd


Input: Consider Input: wEsqOKUXWvJHy, sOEwXyKUXWvJWJYe


Output: KUXWvJ