instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW
answer:
oOwfOl


question:
jkGcUm, dxGcSI
answer:
Gc


question:
HZOqZescbZqP, cuZescBz
answer:

Zesc