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

Input: Consider Input: XMtSwZVAHsNYhbyDm, asAVAHsNYhSPuNLrV

Output: VAHsNYh


Input: Consider Input: zfUPUDeKbCMQa, BkAJFJUDeKbCMZmkFu

Output: UDeKbCM


Input: Consider Input: cpXGSeoMkLHcoRn, ZgyMHXGSeoMkrpH


Output: XGSeoMk