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

[Q]: HSsyZzZLZAAq, MFEZzZLJC
[A]: ZzZL


[Q]: jJjsASFfCqVV, AkjsASFfBFwPy
[A]: jsASFf


[Q]: CAkMbH, CYkMvN
[A]:
kM