TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: UQDJDbzqDxsMzUL, BxClJDbzqDxLxlngc

SOLUTION: JDbzqDx

PROBLEM: nXVXIEGP, fkXIEkU

SOLUTION: XIE

PROBLEM: QnVTJfUkDcVwRjLG, UogXUrafUkDcVwCj

SOLUTION:
fUkDcVw