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

[Q]: TdvkBvVyJcSdYGGPfnyml, rIvIvVyJcSdYhtxG
[A]: vVyJcSdY


[Q]: bOvlVNWf, iivlVzWt
[A]: vlV


[Q]: TzgZFOXvAIIiJk, DQsOXvAItHgwc
[A]:
OXvAI