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

[Q]: uqazNuZhdJhw, KbnrzNuZhBdp
[A]: zNuZh


[Q]: OhMVLbQhBxEaOZY, iDVLbQhBxBiiD
[A]: VLbQhBx


[Q]: UxEyHS, UNEyLO
[A]:
Ey