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

[Q]: QjDQjzAIsnYgNmmetl, vyqDQjzAIsnNajYEheP
[A]: DQjzAIsn


[Q]: RwduMBkDazrwZP, UPzcwtWMBkDazrAw
[A]: MBkDazr


[Q]: MpYLUUVEQdDZmNbq, jqAUVEQdDvm
[A]:
UVEQdD