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

[Q]: CCzKRbuEAmN, qTLzKRbuhEqq
[A]: zKRbu


[Q]: uqazNuZhdJhw, KbnrzNuZhBdp
[A]: zNuZh


[Q]: qaJpYEHym, fDYiJpYEtkYd
[A]:
JpYE