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]: HorIyjpfBFmKZQUIEoP, AcWOaOgVPmyjpfBFmKZQPFYiI
[A]: yjpfBFmKZQ


[Q]: VvJoUrnUpQlIeGtUE, CKnUpQlIepkTSyA
[A]:
nUpQlIe