instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
yjoJzBGdwfOhsceoOpoap, uSLMdBGdwfOhsIQHBijd
answer:
BGdwfOhs


question:
bSBuJiZniSlZtO, AcuJiZniSRAOAv
answer:
uJiZniS


question:
rMhkXb, VuhkIe
answer:

hk