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

Q: VpJvIZdkzKovjc, BZEizZdkzKYZ

A: ZdkzK
****
Q: ahPbomjSH, rBbomynK

A: bom
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Q: BuLSqHBjcRHlrgD, PjGAdHBjcRcP

A:
HBjcR
****