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

uHGHiARtdJbuG, OdZmiARtdrhC
iARtd

OUNqomxFcLXhWdfB, gdqomxFcLHQPCu
qomxFcL

SWiUDicqnuS, WXyiUDicTkNjS

iUDic