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

Input: Consider Input: HKqfdEvqDuGhWByFlzIEeYh, VVaZfkLCMuGhWByFlzIOZaXbMCA

Output: uGhWByFlzI


Input: Consider Input: pBDnbfrAxJfVhPBxheXZGp, LMtorAxJfVhPnnaed

Output: rAxJfVhP


Input: Consider Input: cIFXmnKUtMKTaC, DxKGUmnKUtMzqYb


Output: mnKUtM