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

[Q]: BTvLVMYp, mjOvLVMqYo
[A]: vLVM


[Q]: DwkTGsIXLfmjMV, VqRlMxtsSBkTGsIXLfmjbvI
[A]: kTGsIXLfmj


[Q]: UIjAMFDuxDDGkfQa, VdsHuxDDGkfZHZZ
[A]:
uxDDGkf