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

SOLUTION: OvRprXyFf

PROBLEM: UZbmGVDzIaf, qfHwqGVDzIsd

SOLUTION: GVDzI

PROBLEM: fFqXRRqtltzC, IovDuRRqtlcrc

SOLUTION:
RRqtl