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

Input: Consider Input: pySBCdpe, AEBCdOR

Output: BCd


Input: Consider Input: FNVeaFmprNHqqtAaKv, iGBmrrMveaFmprNHqWWAvtht

Output: eaFmprNHq


Input: Consider Input: BUvWkxrAvDQG, rHrkxrAkCE


Output: kxrA