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

Input: Consider Input: QKlzsmHyBcC, snPtzsmHdMIv

Output: zsmH


Input: Consider Input: PGjDRPDzGaBR, rpIJRPDzWi

Output: RPDz


Input: Consider Input: ZVImHHYrasUTJfGPdK, hsfHHYrasUwKV


Output: HHYrasU