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

Input: Consider Input: OrcQOvMBhmwP, mnWrzcQOvMBnLwI

Output: cQOvMB


Input: Consider Input: OgWFOfjNYmXVjBBvOdunIc, eGljKGnzFKFOfjNYmXVjdlqsT

Output: FOfjNYmXVj


Input: Consider Input: HJuoDXGTxCxR, kjAZuoDXGdyflL


Output: uoDXG