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

UQDJDbzqDxsMzUL, BxClJDbzqDxLxlngc
JDbzqDx

cCDTMXjGMNikONun, jpcMXjGMNizBEWQzT
MXjGMNi

qYlHjFkFUtbakOnffUrxYFQkwk, HnMYhAbzttbakOnffUemMxpb

tbakOnffU