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

Input: Consider Input: cvRdSsuNwGVEwSSrowDpaOu, gFMcLKIeLwNwGVEwSSroUGskaoloqC

Output: NwGVEwSSro


Input: Consider Input: rduIwWNGM, AJqYIwWNaCap

Output: IwWN


Input: Consider Input: BCnAXYzxGOTknDm, gTVeQfYzxGOTmIcDn


Output: YzxGOT