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

SOLUTION: yXsYzY

PROBLEM: plSfJAktMfac, TCjYJAktlt

SOLUTION: JAkt

PROBLEM: zBneYrdMJNJZB, yVJFoAcZeYrdMJNJqTSiUwgA

SOLUTION:
eYrdMJNJ