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]: BmwpAnWJ, klVwpAFw
[A]: wpA


[Q]: ljbcyarFIoqvfRLIAFQp, XwyhnWrFIoqvfjoRDB
[A]:
rFIoqvf