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

[Q]: OezHeoe, ouUzHemU
[A]: zHe


[Q]: ScUCglVzZFPjLVofNHOumU, mNodEXwpZFPjLVofYfSnBM
[A]: ZFPjLVof


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


