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]: nxTtNYaazlOyEBApiUSJS, BLazlOyEBCV
[A]: azlOyEB


[Q]: TvNVpHLPYjBCeUpyxlzFZ, tgKdPKVYjBCeUpyPK
[A]:
YjBCeUpy