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

Answer: FPGzUsgCO


Question: lMRuEThD, wqQRuEKp

Answer: RuE


Question: hDmAOQLofS, UCTmAOQSCTp

Answer:
mAOQ