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

[Q]: LudFxiaqbX, UWMPnFxiaqikiDx
[A]: Fxiaq


[Q]: OVVkkdeHoFlyNROyCP, zFVUJbvkkdeHoFlysF
[A]: kkdeHoFly


[Q]: TzhDemza, fZhDepIj
[A]:
hDe