In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

[Q]: QRPOwtZATjDoJDdRNNSOH, wiafFMwpAjDoJDdRNNuCDZ
[A]: jDoJDdRNN


[Q]: XmiLktrUjJDOCJ, UIKrUjJDOQsR
[A]: rUjJDO


[Q]: KABXTaZCCPxazoL, DBvWgAEMgXTaZCCPxaOfk
[A]:
XTaZCCPxa