instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
jdLbZSCzaAHGbNwILGmudOH, RdIPuEYJvUZSCzaAHGbNduLToRC
answer:
ZSCzaAHGbN


question:
GrvtMjEvRlmN, ifGOWMjEvRPSOZK
answer:
MjEvR


question:
kSAGFyqzgMPytRtDCYrkBe, ENqqetxOKcPytRtDCYrkirRwahHy
answer:

PytRtDCYrk