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

SOLUTION: uJiZniS

PROBLEM: RJMYumLAlhmnbhzKRzIOWsGrxGu, VEViqlihmnbhzKRzIBArjAhYrz

SOLUTION: hmnbhzKRzI

PROBLEM: FwENOBGhhFyyNnbOxbDZ, EicNOBGhhFyyJMsuTDGnP

SOLUTION:
NOBGhhFyy