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

Input: Consider Input: KKebLWQCQzVIojj, nxQCQzVIopD

Output: QCQzVIo


Input: Consider Input: aIZIsqL, wxSZIsEnO

Output: ZIs


Input: Consider Input: AaMbGBOH, GHJMMbGBYC


Output: MbGB