In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: nxoXDohHr, WcbkXDohFbJ

Answer: XDoh


Question: UldKHMpUYADGfEUGcSon, nPHMpUYADGfEKqHCLPmL

Answer: HMpUYADGfE


Question: kjlyDvr, RyxlyDGe

Answer:
lyD