instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
uDaqoOpUtLDdTGTO, ncIgBjDPqoOpUtLDdTNtiEyarDO
answer:
qoOpUtLDdT


question:
HorIyjpfBFmKZQUIEoP, AcWOaOgVPmyjpfBFmKZQPFYiI
answer:
yjpfBFmKZQ


question:
qMnjlfIsQRtUlPggCpHqu, gfVndMwYDIsQRtUlPgqBJKCX
answer:

IsQRtUlPg


