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

SOLUTION: NP

PROBLEM: GnElFKBIoYmAdvz, GrElFKBIoMo

SOLUTION: ElFKBIo

PROBLEM: mhOXogigURLREShQYz, nGUzHKgogigURLatpjXZV

SOLUTION:
ogigURL