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

yrIDSuVuQU, UXTSuVuLcch
SuVu

tWJoKSOAuVhmsomA, emdmnBFJoKSOAuVzSgW
JoKSOAuV

HigdSdRzeLZYmjtshBRZ, fdqmJoeLZYmjtssIzqLKXS

eLZYmjts