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

Input: Consider Input: LJJvLTK, jpFJvLqh

Output: JvL


Input: Consider Input: fBpRXPkikQokGVeS, FwUbKXkikQokGos

Output: kikQokG


Input: Consider Input: RsxvjzkUWGoNb, oEUvjzkUyojJc


Output: vjzkU