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

[Q]: wYhGWdRC, cFGWdHEy
[A]: GWd


[Q]: VGRjWGHRcBdFmkVg, eSwqALQXWGHRcBdFsDXCM
[A]: WGHRcBdF


[Q]: qxshja, PzshHG
[A]:
sh