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

Input: Consider Input: CxosNa, ikosdx

Output: os


Input: Consider Input: CCzKRbuEAmN, qTLzKRbuhEqq

Output: zKRbu


Input: Consider Input: FMMnkKuTrnTCL, RXqrsvMnkKuTpKT


Output: MnkKuT