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

[Q]: RwduMBkDazrwZP, UPzcwtWMBkDazrAw
[A]: MBkDazr


[Q]: OhMVLbQhBxEaOZY, iDVLbQhBxBiiD
[A]: VLbQhBx


[Q]: zovdLr, qvvdrj
[A]:
vd