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

[Q]: bVlwKYBYmcNq, hBlwKYBprL
[A]: lwKYB


[Q]: QRPOwtZATjDoJDdRNNSOH, wiafFMwpAjDoJDdRNNuCDZ
[A]: jDoJDdRNN


[Q]: gpVDgyskIZsNqXVLAa, UsvSrVDgyskIZsam
[A]:
VDgyskIZs