instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
bSBuJiZniSlZtO, AcuJiZniSRAOAv
answer:
uJiZniS


question:
hUpEbyvEcQ, dHpEbyvEvwsXcN
answer:
pEbyvE


question:
BmwpAnWJ, klVwpAFw
answer:

wpA