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

Input: Consider Input: TdvkBvVyJcSdYGGPfnyml, rIvIvVyJcSdYhtxG

Output: vVyJcSdY


Input: Consider Input: rvLoiycpZw, idcvoiycpcLyD

Output: oiycp


Input: Consider Input: gkLwdt, ACLwwk


Output: Lw