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

Input: Consider Input: NNpkdhvgT, BMkAkdhvrwV

Output: kdhv


Input: Consider Input: VpJvIZdkzKovjc, BZEizZdkzKYZ

Output: ZdkzK


Input: Consider Input: GNTNywduhEzhc, OXtNywduhPWG


Output: Nywduh