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

Q: iYSNsY, HSSNhP

A: SN
****
Q: DwkTGsIXLfmjMV, VqRlMxtsSBkTGsIXLfmjbvI

A: kTGsIXLfmj
****
Q: sACtMiLiXnfiVbK, AulQLiXnfickeyX

A:
LiXnfi
****