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

Input: Consider Input: jXbgnl, lUbglP

Output: bg


Input: Consider Input: nFgMXUzpStDAybiwm, aNJrXUzpStDjp

Output: XUzpStD


Input: Consider Input: YWTDya, zFTDQq


Output: TD