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

Input: Consider Input: qMnjlfIsQRtUlPggCpHqu, gfVndMwYDIsQRtUlPgqBJKCX

Output: IsQRtUlPg


Input: Consider Input: hUpEbyvEcQ, dHpEbyvEvwsXcN

Output: pEbyvE


Input: Consider Input: JSOFwTJQKSF, ZqXCAwTJQKQOdV


Output: wTJQK