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

[Q]: krnkpodgfpCKtfCqyzUbymWbxi, DydgSWpCKtfCqyzDaMsjqc
[A]: pCKtfCqyz


[Q]: lkFGXvTkKm, wwELXvTkcOnG
[A]: XvTk


[Q]: HfmkbrzQxYxd, fYbrzQhy
[A]:
brzQ