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

Q: TnbLNKnNSs, NhDLNKnNRd

A: LNKnN
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Q: BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT

A: joSidWiv
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Q: FKnndMDtpshgSmOQVGqO, DxcVnMDtpshgSmOth

A:
MDtpshgSmO
****