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

[Q]: ptVlCwpfOZIi, QEdyVlCwpfOwp
[A]: VlCwpfO


[Q]: RMurrwPjlfG, QBKrrwPDkTM
[A]: rrwP


[Q]: bPEyEj, KgEyra
[A]:
Ey