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

[Q]: tWJoKSOAuVhmsomA, emdmnBFJoKSOAuVzSgW
[A]: JoKSOAuV


[Q]: OjQHcFUCflYUptUPqYKVomn, GXHcFUCflYUpSSTrQ
[A]: HcFUCflYUp


[Q]: RGUcSVcDuswrWDsCoFTPYTIk, nffLnwcVeswrWDsCoFNyM
[A]:
swrWDsCoF