instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
YHLJZrFQ, aSLJZQuo
answer:
LJZ


question:
SQNzngllNbOkKDK, MijfNzngllNDfWge
answer:
NzngllN


question:
JbAcPieNSMN, VbcPieNGBwAT
answer:

cPieN