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

[Q]: rvLoiycpZw, idcvoiycpcLyD
[A]: oiycp


[Q]: HiEuutntEBpU, fdkqEuutntEBABdGZRND
[A]: EuutntEB


[Q]: CyOZVWNELNe, UwZVWNZFZo
[A]:
ZVWN