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

[Q]: kWTQrtCaoTbXIiXDphMG, pLhxkfeDoTbXIiXDpCCzTYyZv
[A]: oTbXIiXDp


[Q]: dsngGP, KvnglB
[A]: ng


[Q]: jdJXbGVkBJH, YzGgJXbGVjE
[A]:
JXbGV