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

Input: Consider Input: MvALRGKkpALcKdhTtnm, neMkRGKkpALcKdcaxnXEPxW

Output: RGKkpALcKd


Input: Consider Input: iJbjApY, ggwbjAws

Output: bjA


Input: Consider Input: UvBQvPIXyqoP, PkCjyQvPIXMyTTd


Output: QvPIX