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

Q: bjjsMtBzzXIgYWPBZmaDL, iTxktmvBzzXIgYWPhbAyBE

A: BzzXIgYWP
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Q: nrIHKzJCdAQzUDRBYpg, JDzJCdAQzUMMYrLcfO

A: zJCdAQzU
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Q: jlVnJavJBKUCUFkFM, ZmVAbmJBKUCUFHdQkcG

A:
JBKUCUF
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