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

[Q]: sRTQgRgRUjEooapKdR, vzsBgRUjEooLBkYeH
[A]: gRUjEoo


[Q]: rlBoVyFsYqpmmQmelGBg, iKKaIyFsYqpmmWcrKn
[A]: yFsYqpmm


[Q]: EQAUUBHfNdo, mkMpAUUBHfdELXZt
[A]:
AUUBHf