instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
UQDJDbzqDxsMzUL, BxClJDbzqDxLxlngc
answer:
JDbzqDx


question:
ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW
answer:
oOwfOl


question:
NTFlxFaXbOTqOL, FboJIaFaXbOTqGZC
answer:

FaXbOTq