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

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


[Q]: yKtQOhYvrJVH, HQsTQOhYvPP
[A]: QOhYv


[Q]: YkLLKpEQyjBKWTxnnl, utVXcWkepEQyjBKWTgWiTFnX
[A]:
pEQyjBKWT