instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
aZcGMvzBhazkCIFqpVe, AOljBvzBhazkWXeTuA
answer:
vzBhazk


question:
srPyjmTQhdFFMcQ, QQGBdtyjmTQhmfEy
answer:
yjmTQh


question:
HKSnaPFBlWdB, ODjiTSnaPFBlrkWo
answer:

SnaPFBl