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

SOLUTION: bom

PROBLEM: AuSFmN, crSFXM

SOLUTION: SF

PROBLEM: RHtWqrqlgfdZVTMtG, zQhxEhCrqlgfdZVGvvzVB

SOLUTION:
rqlgfdZV