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

Q: CdRbREFMEDTXnEzgn, zHLEMMEDTXnEPH

A: MEDTXnE
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Q: TUAHhdvHIBxogI, LjfGsAHhdvHJcSdNV

A: AHhdvH
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Q: dNuaQuEUpwBZCbZ, tRuEUpwBlFX

A:
uEUpwB
****