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

[Q]: CzkPtkpMTDeNZwCPbJJn, HzpMVDeNZwCPbJVOU
[A]: DeNZwCPbJ


[Q]: zgJGhxLU, EwJGhedW
[A]: JGh


[Q]: dHqxYhKSJuuHZi, HLGVhKSJusXyw
[A]:
hKSJu