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

Input: Consider Input: zRwQdelc, UdAUwQdejhe

Output: wQde


Input: Consider Input: RyaNyUvXAaZHLXUtYuz, CkbsWxZyUvXAaZHLXJJzugDy

Output: yUvXAaZHLX


Input: Consider Input: gEbKqR, GobKtH


Output: bK