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

[Q]: OBzHWjmkcgVGPyv, gCHWjmkcgVMq
[A]: HWjmkcgV


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


[Q]: zSdqbxUicmCvGdWgVhjMzmpFYfvAvq, uNIHMCvGdWgVhjMDHKzhlJE
[A]:
CvGdWgVhjM