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

Q: bSBuJiZniSlZtO, AcuJiZniSRAOAv

A: uJiZniS
****
Q: RAmKlEAUfWcgF, ZlWfEAUfWvVRa

A: EAUfW
****
Q: afpiqvtPbGaexfxTFKq, lzavtPbGaexNZLQMr

A:
vtPbGaex
****