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

Q: HorIyjpfBFmKZQUIEoP, AcWOaOgVPmyjpfBFmKZQPFYiI

A: yjpfBFmKZQ
****
Q: wnIFoRQvMMKMAqpCQYncuWUTJs, bPMUKKxYRxQvMMKMAqpCmzAPPMD

A: QvMMKMAqpC
****
Q: mqwQgNzSUox, GuAwtwQgNzSGIHC

A:
wQgNzS
****