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

SOLUTION: cQOvMB

PROBLEM: AedXEOrEgvnzF, TVTEOrEgvxKuJgv

SOLUTION: EOrEgv

PROBLEM: hjUiIlyusi, WUFUiIlyuUPEYCk

SOLUTION:
UiIlyu