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

[Q]: CiTNsbepy, DFNsbeZl
[A]: Nsbe


[Q]: iJbjApY, ggwbjAws
[A]: bjA


[Q]: lYExtOGQNRkVe, npgUytOGQNPl
[A]:
tOGQN