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

Input: Consider Input: tWJoKSOAuVhmsomA, emdmnBFJoKSOAuVzSgW

Output: JoKSOAuV


Input: Consider Input: xzMUdHcoYJFWLOILjrg, vCscoYJFWLzO

Output: coYJFWL


Input: Consider Input: QsVsjKMemQcQbSdPTZNL, qUxPjbmQcQbSdPTBXfyigt


Output: mQcQbSdPT