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

[Q]: DwkTGsIXLfmjMV, VqRlMxtsSBkTGsIXLfmjbvI
[A]: kTGsIXLfmj


[Q]: tyVlHfTPLRSdFilXnSfqQ, bkTPLRSdFiMgXC
[A]: TPLRSdFi


[Q]: SJFOXDLzlUa, ueOXDLzrH
[A]:
OXDLz