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

Input: Consider Input: iMwanJBuMdiZDL, kIafHeBuMdiZmKNA

Output: BuMdiZ


Input: Consider Input: AedXEOrEgvnzF, TVTEOrEgvxKuJgv

Output: EOrEgv


Input: Consider Input: GgcgHh, BhcgGy


Output: cg