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

BVipiZoGXaWdjmDsxWP, yxppsiYkiZoGXaWdjoDRuKW
iZoGXaWdj

bVlwKYBYmcNq, hBlwKYBprL
lwKYB

CwbcFNtZA, RVLUQbcFNtje

bcFNt