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

[Q]: egYXVtCPvWxP, VMOolyVtCPvWjIx
[A]: VtCPvW


[Q]: FNVeaFmprNHqqtAaKv, iGBmrrMveaFmprNHqWWAvtht
[A]: eaFmprNHq


[Q]: AvUjrf, NFUjCN
[A]:
Uj