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

Input: Consider Input: KTAFonizDqCVvucpJWrItdw, rfFonizDqCVvYbGhb

Output: FonizDqCVv


Input: Consider Input: DGvUCrUVlUnQBShkWnfnceGasvI, NfzGUnQBShkWnpLMnY

Output: UnQBShkWn


Input: Consider Input: CVJDHVdm, VGJDHiRH


Output: JDH