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

[Q]: gHFwDorPbNPORVgdLW, AfqDQvCGFwDorPbNPVPVmbQ
[A]: FwDorPbNP


[Q]: WjyKtxKtEYjP, vuBZJZyKtxKtXRZs
[A]: yKtxKt


[Q]: HlwuFSvwjfg, UVgbuFSvcBjy
[A]:
uFSv