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

Q: haOsaSQcyodWhqQaC, BKLEUQcyodWhvVkmxBz

A: QcyodWh
****
Q: lLxXqKscqizXTO, TqrKscqizutDudo

A: Kscqiz
****
Q: vMVDkhjRaDVGkxSGy, XnrFYJhjRaDVGkVpEAM

A:
hjRaDVGk
****