instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
zBxuZfJgYrlRSzkmAktO, YNMgYrlRSzklmBOH
answer:
gYrlRSzk


question:
uDaqoOpUtLDdTGTO, ncIgBjDPqoOpUtLDdTNtiEyarDO
answer:
qoOpUtLDdT


question:
uLVNCSrhFeoGX, uJkZOSrhFeYtBA
answer:

SrhFe