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

Answer: loJanutXoO


Question: UQDJDbzqDxsMzUL, BxClJDbzqDxLxlngc

Answer: JDbzqDx


Question: praGMDJIm, tnjGMDbYx

Answer:
GMD