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

[Q]: lsNwypFwhKP, diEfLwypFwEKqCN
[A]: wypFw


[Q]: ocjsZZfSBBopDtgWUT, rWmgzsZZfSBBoGWQ
[A]: sZZfSBBo


[Q]: VutZiVkDQcVpQO, BDQVDyBdiVkDQcVpuvNN
[A]:
iVkDQcVp