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

Input: Consider Input: xzMUdHcoYJFWLOILjrg, vCscoYJFWLzO

Output: coYJFWL


Input: Consider Input: CuizrSvJTRWZK, udyrSvJTRZzkS

Output: rSvJTR


Input: Consider Input: fMOQqIbIwSfYSEritSywFEb, gkGbIwSfYSEriccuJswLoRi


Output: bIwSfYSEri