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

[Q]: tmBlKUto, eFDBlKLy
[A]: BlK


[Q]: WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu
[A]: NrxXeUrKC


[Q]: zGvUaFppvyuJmbRzFVIMGh, SuppvyuJmblOssOs
[A]:
ppvyuJmb