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: XMtSwZVAHsNYhbyDm, asAVAHsNYhSPuNLrV

SOLUTION: VAHsNYh

PROBLEM: ptCYGnWk, KiCYGTde

SOLUTION:
CYG