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

[Q]: mJoHBJehHtkFS, ZMrDxHBJehHtxS
[A]: HBJehHt


[Q]: HHJAHyvNCGmJEljWrjvHOqf, msPVEbNCGmJEljsKRX
[A]: NCGmJElj


[Q]: LwupxdtkuEruiXUvS, wNXpxdtkuEruQPXtIADzZ
[A]:
pxdtkuEru