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

[Q]: kIBDjQLEZepVNHqnKqhine, hTZepVNHqnYTajyzv
[A]: ZepVNHqn


[Q]: XWKEpwGRkfCFZGOyZQOoypx, lhQkmVqeRkfCFZGOyugPLqs
[A]: RkfCFZGOy


[Q]: bqMWdwFiJXpvdeEfnxv, tSjqYMAyjdwFiJXpvdeul
[A]:
dwFiJXpvde