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

[Q]: BVipiZoGXaWdjmDsxWP, yxppsiYkiZoGXaWdjoDRuKW
[A]: iZoGXaWdj


[Q]: gfXPLNzsyfEotmHL, oJeXPLNzsyJuXP
[A]: XPLNzsy


[Q]: PEqwHkSDbqgWqHaGUxQkt, UaGRqxiwHkSDbqgWNOnMtXOzs
[A]:
wHkSDbqgW