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

Q: vMsEJRoLkWcmkuwNRz, ZmoLkWcmVZiBv

A: oLkWcm
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Q: nxTtNYaazlOyEBApiUSJS, BLazlOyEBCV

A: azlOyEB
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Q: yOGvgtAmwMwcIRtJ, cQtAmwMwcIRjfjO

A:
tAmwMwcIR
****