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

SOLUTION: hfHvcRouH

PROBLEM: TizkNtJUPHfhmGQ, enzehVkNtJUPHunpG

SOLUTION: kNtJUPH

PROBLEM: BvQinkgqxCkQvvwV, wIEzkgqxCkov

SOLUTION:
kgqxCk