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

[Q]: RyaNyUvXAaZHLXUtYuz, CkbsWxZyUvXAaZHLXJJzugDy
[A]: yUvXAaZHLX


[Q]: jdLbZSCzaAHGbNwILGmudOH, RdIPuEYJvUZSCzaAHGbNduLToRC
[A]: ZSCzaAHGbN


[Q]: QqbmPAgA, EKbmPOjU
[A]:
bmP