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

[Q]: koddLvYmRXDUuUnW, GnqDYGmmRXDUuUquAnf
[A]: mRXDUuU


[Q]: RMurrwPjlfG, QBKrrwPDkTM
[A]: rrwP


[Q]: EPVGISBdvndzGasGy, vGHwQBdvndzGasOf
[A]:
BdvndzGas