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

Q: cfvqbAUpWEmhCSFaUvGrYVNGeUiRP, hAxWMEmhCSFaUvGLBLmdTxhy

A: EmhCSFaUvG
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Q: sRpnJlgECTHh, JXfmNJlgECKyry

A: JlgEC
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Q: vsEDSRkTBMqXMQAkcjGh, bMXGGnYiTBMqXMQAkcsMgZeSQYU

A:
TBMqXMQAkc
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