In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: wLLwjL, arLwXm

Answer: Lw


Question: YPeBvuJXaSLLPhKpUQ, ryjPdyuJXaSLLPhIzBeJP

Answer: uJXaSLLPh


Question: yBoSmWOonfGRSyBIVLG, tZnFmWOonfGRYL

Answer:
mWOonfGR