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

[Q]: BdqUloJanutXoOyfLsuA, NRDloJanutXoOQY
[A]: loJanutXoO


[Q]: TWVTGNBh, nEVTGWq
[A]: VTG


[Q]: zrjVubNBGqBIxtZKky, SsRbNBGqBIwVXwnp
[A]:
bNBGqBI