instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
nuwMzarLqoPvabJla, JKcrLqoPvabJNDCILGQ
answer:
rLqoPvabJ


question:
TizkNtJUPHfhmGQ, enzehVkNtJUPHunpG
answer:
kNtJUPH


question:
ATmVEtUuZOgsBUuL, UMUuZOgsBPVT
answer:

UuZOgsB