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

Input: Consider Input: PQCjJwXurLeN, vsjJwXuOy

Output: jJwXu


Input: Consider Input: libDFDxIgRiglWfxMVRr, yMltDxIgRiglpms

Output: DxIgRigl


Input: Consider Input: vWGWpHpZdXKBGHMPSgGMx, TuHpZdXKBGfjhs


Output: HpZdXKBG