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

Q: kOrQWjLKnwN, xFsWjLKgr

A: WjLK
****
Q: lLxXqKscqizXTO, TqrKscqizutDudo

A: Kscqiz
****
Q: djuUMLZyzaVD, BhMLZyzaCgNf

A:
MLZyza
****