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:
ZGkBNEDRAwURXnxBIOJkzTvg, HMAwURXnxBMfGbPOBf
answer:
AwURXnxB


question:
mYCOOIsDPZTmiPGlcb, LjgFrmDPZTmiPsdh
answer:

DPZTmiP