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

[Q]: fBpRXPkikQokGVeS, FwUbKXkikQokGos
[A]: kikQokG


[Q]: rvLoiycpZw, idcvoiycpcLyD
[A]: oiycp


[Q]: xyuZdj, TsuZQq
[A]:
uZ