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

Input: Consider Input: RAmKlEAUfWcgF, ZlWfEAUfWvVRa

Output: EAUfW


Input: Consider Input: ZGkBNEDRAwURXnxBIOJkzTvg, HMAwURXnxBMfGbPOBf

Output: AwURXnxB


Input: Consider Input: rsCgyI, mPCgqL


Output: Cg