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

[Q]: RNYHvcNnbsUdJLvS, PpNnbsUdglWhl
[A]: NnbsUd


[Q]: OyXwTWbLByC, yODnTWbLWYzc
[A]: TWbL


[Q]: jexvmCmveGzFUimQMx, RVwOSJveGzFUimrcOwjEwe
[A]:
veGzFUim