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

[Q]: oXZmCSdFrMumlZcP, eFpOZmCSdFrIuHeS
[A]: ZmCSdFr


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


[Q]: rJCNCqZDWiMbdeKWnRxa, yOjghJPPWiMbdeKWnkZvlP
[A]:
WiMbdeKWn