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

Q: YRNpKFPGzUsgCOBJgbVG, TdEpMngFPGzUsgCOZykYRrLp

A: FPGzUsgCO
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Q: KfjqnJLciTXqkJK, yqfRcfqnJLcisSB

A: qnJLci
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Q: djBRoPdVJsKohuDJHWz, HCmOCvVJsKohuDJHbNfLbfeQ

A:
VJsKohuDJH
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