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]: RinootTGLjbRGYznmBdH, oRMtTGLjbRGYzwEVHsjW
[A]: tTGLjbRGYz


[Q]: LezsumtBiDt, dSyumtBaD
[A]:
umtB