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

[Q]: RinootTGLjbRGYznmBdH, oRMtTGLjbRGYzwEVHsjW
[A]: tTGLjbRGYz


[Q]: mXHhaCEIwqwEZcz, JZPXbYHhaCEIwZmna
[A]: HhaCEIw


[Q]: AdptcnXMiQg, RXkAwptcnXDx
[A]:
ptcnX