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

Input: Consider Input: HiEuutntEBpU, fdkqEuutntEBABdGZRND

Output: EuutntEB


Input: Consider Input: ktABEFESAVHZkkY, uMjxiESAVHZkZgWUte

Output: ESAVHZk


Input: Consider Input: RHFdba, HNFdDx


Output: Fd