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

SOLUTION: dBOwvr

PROBLEM: nXVXIEGP, fkXIEkU

SOLUTION: XIE

PROBLEM: LZdxMfddtxwEJHVdUyCDb, ZHmxVbHgxwEJHVdUyCCDrTktI

SOLUTION:
xwEJHVdUyC