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

Q: ahPbomjSH, rBbomynK

A: bom
****
Q: ATmVEtUuZOgsBUuL, UMUuZOgsBPVT

A: UuZOgsB
****
Q: EszRhPEw, XtURhPCW

A:
RhP
****