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

Q: DGvUCrUVlUnQBShkWnfnceGasvI, NfzGUnQBShkWnpLMnY

A: UnQBShkWn
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Q: FQAznAuFjoBKRKB, hPmtFFPnuAznAuFjoBKTgkeJyjcd

A: AznAuFjoBK
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Q: TPDVxZpmXlPKgVGKb, FOKDgZSqRDVxZpmXlPKCnONduuPv

A:
DVxZpmXlPK
****