instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
RJMYumLAlhmnbhzKRzIOWsGrxGu, VEViqlihmnbhzKRzIBArjAhYrz
answer:
hmnbhzKRzI


question:
AedXEOrEgvnzF, TVTEOrEgvxKuJgv
answer:
EOrEgv


question:
eZqoHoviWZHz, PZdVbHoviWgfomU
answer:

HoviW