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

Input: Consider Input: AeYjeKwZQillzpD, SnqviKwZQillrxuTB

Output: KwZQill


Input: Consider Input: kUoqCMPFTqGE, guoqCMPkwJs

Output: oqCMP


Input: Consider Input: LPWCiN, lLWCkm


Output: WC