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

Q: BTvLVMYp, mjOvLVMqYo

A: vLVM
****
Q: VRamNL, mUamIB

A: am
****
Q: nMStLwjjlRKjBAGjUeYh, JrGbtStLwjjlRKJQAn

A:
StLwjjlRK
****