instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
oZZUNCUHtIiauDxQ, OdindZUNCUHtIiLQmWJJf
answer:
ZUNCUHtIi


question:
DhhYhrqVMXSoyvXQwqPKzWARAP, CaMXSoyvXQwqcDDtMsVqD
answer:
MXSoyvXQwq


question:
VyFduMiQORrznzhglhn, yKhhqgdiQORrznzuohf
answer:

iQORrznz