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

[Q]: bVlwKYBYmcNq, hBlwKYBprL
[A]: lwKYB


[Q]: bmZKWkYPqugcvzbHykblPzQLhK, tPUzKqugcvzbHypzk
[A]: qugcvzbHy


[Q]: ubNVguiHCggasSiKA, KYguiHCggPXi
[A]:
guiHCgg