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

Answer: WTTPho


Question: AuSFmN, crSFXM

Answer: SF


Question: YGwAbonHzGwsQQCBKmJ, OkonHzGwsFRncwF

Answer:
onHzGws