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

Input: Consider Input: HorIyjpfBFmKZQUIEoP, AcWOaOgVPmyjpfBFmKZQPFYiI

Output: yjpfBFmKZQ


Input: Consider Input: trHTzJpm, aCHTzVVA

Output: HTz


Input: Consider Input: erPPXPCnBJqK, IbuPCnBJSIrOA


Output: PCnBJ