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

Answer: yvwHq


Question: IKrQfT, crrQRg

Answer: rQ


Question: UHVngCEMhRXiGL, fruTUVngCEMctwDSE

Answer:
VngCEM