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

[Q]: CxosNa, ikosdx
[A]: os


[Q]: VGRjWGHRcBdFmkVg, eSwqALQXWGHRcBdFsDXCM
[A]: WGHRcBdF


[Q]: SGuFOGzFcbZLvzqjeL, fUOGzFcbZCLHx
[A]:
OGzFcbZ