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

Q: bVlwKYBYmcNq, hBlwKYBprL

A: lwKYB
****
Q: nYoRQU, gQoRZQ

A: oR
****
Q: EYVqVEAVp, FuUVqVEJOUi

A:
VqVE
****