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

[Q]: gwVLygvd, VOQLyglfo
[A]: Lyg


[Q]: uHGHiARtdJbuG, OdZmiARtdrhC
[A]: iARtd


[Q]: mmDhYqPJC, qThYqxW
[A]:
hYq