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

Q: aWshKwEuYBBdSwIAyXw, wfVuYBBdSwIAseTxR

A: uYBBdSwIA
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Q: DnAzbgMtdPKsNCMpBfc, QdfXRkWREzbgMtdPKsGx

A: zbgMtdPKs
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Q: FjVXcSDoIYSCN, KfvXcSDoIGytImc

A:
XcSDoI
****