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

Answer: zLSz


Question: YcgVJVACcQE, JsJVACcSz

Answer: JVACc


Question: yxFlCOCCPDBGVUGIFhWx, NAAuHuCPDBGVUGyZiVeH

Answer:
CPDBGVUG