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

[Q]: zqwhMdAdXQfQCAmVNaYZm, toYMIwQeadAdXQfQCAmLyheFOv
[A]: dAdXQfQCAm


[Q]: mjCEUoPmeKbvCgUtUL, SrHtrPmeKbvYpQAVp
[A]: PmeKbv


[Q]: dNAJFV, vhAJjS
[A]:
AJ