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

Q: zeuyZKwvIOfx, BlmZKwvspUt

A: ZKwv
****
Q: CdRbREFMEDTXnEzgn, zHLEMMEDTXnEPH

A: MEDTXnE
****
Q: WPLAHu, aZLAUb

A:
LA
****