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:
JzbEpAquDJFKcNvEWZxVqRV, PFiJlpAquDJFKcNcqOpMeAv
answer:
pAquDJFKcN


question:
ZZEULNjPUfMWjio, BVjPUfMWxbN
answer:

jPUfMW