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

Input: Consider Input: krnkpodgfpCKtfCqyzUbymWbxi, DydgSWpCKtfCqyzDaMsjqc

Output: pCKtfCqyz


Input: Consider Input: BmxgSFWBlVX, kGgKrgSFWBlGunFcZ

Output: gSFWBl


Input: Consider Input: USoZdVm, draoZdIru


Output: oZd