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

Input: Consider Input: LudFxiaqbX, UWMPnFxiaqikiDx

Output: Fxiaq


Input: Consider Input: oZNKLmfxecDfkXEGFkRBYk, tReqkiExecDfkXEGtNZpJVRxC

Output: xecDfkXEG


Input: Consider Input: hJHkMgMqEW, sggkMgMhPom


Output: kMgM