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

[Q]: XYnCjAWPHHJ, gmCjAWPHpmwVsm
[A]: CjAWPH


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


[Q]: rXWyhr, BeWyPW
[A]:
Wy