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

Q: nxoXDohHr, WcbkXDohFbJ

A: XDoh
****
Q: oXZmCSdFrMumlZcP, eFpOZmCSdFrIuHeS

A: ZmCSdFr
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Q: mLklrWvVBNFEKoWCGtp, RqWvVBNFEKogqI

A:
WvVBNFEKo
****