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

[Q]: rqhQxQQDdYwemFiiwcfVx, cEQDdYwemFtwpfNJC
[A]: QDdYwemF


[Q]: mQvintdwLUpClREgxv, rYnoXBtdwLUpClRwxsqX
[A]: tdwLUpClR


[Q]: xElLZzpMzeIl, YomLlLZzpYZ
[A]:
lLZzp