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

Input: Consider Input: WRfFDeZjIcpidmDxtaJcv, XMxWZjIcpidmlKga

Output: ZjIcpidm


Input: Consider Input: UQDJDbzqDxsMzUL, BxClJDbzqDxLxlngc

Output: JDbzqDx


Input: Consider Input: ReGduLGkyPzOCAtKKWsNN, bvkyPzOCAIn


Output: kyPzOCA