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

Q: egYXVtCPvWxP, VMOolyVtCPvWjIx

A: VtCPvW
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Q: RtAchtNymcswVk, FWRuRchtNymcswUkoERHyML

A: chtNymcsw
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Q: zmGDnYbaHVhcjNZqMdVa, MLabaHVhcjNZGGkbVXS

A:
baHVhcjNZ
****