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

Input: Consider Input: VGRjWGHRcBdFmkVg, eSwqALQXWGHRcBdFsDXCM

Output: WGHRcBdF


Input: Consider Input: SIIPePlrkftKkzfgdjg, JqNnXHrkftKkzOMUwmc

Output: rkftKkz


Input: Consider Input: ZjjaZBbHhcyXfzAv, wbRfhAHhcyXfzOiXk


Output: HhcyXfz