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

Input: Consider Input: XHqQIPw, brqQIkAt

Output: qQI


Input: Consider Input: VeLJEBYpZwxVQlo, EZEBYpZwxVQIxjFj

Output: EBYpZwxVQ


Input: Consider Input: ubrlPYOsHmJ, mMrlPYOsoOXG


Output: rlPYOs