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

[EX Q]: nFgMXUzpStDAybiwm, aNJrXUzpStDjp
[EX A]: XUzpStD

[EX Q]: iUtNuU, iKtNWk
[EX A]: tN

[EX Q]: kovtiRLk, vjTtiRNc
[EX A]:
tiR

