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

SOLUTION: GWd

PROBLEM: bSBuJiZniSlZtO, AcuJiZniSRAOAv

SOLUTION: uJiZniS

PROBLEM: nlEaIdqjKTNpfyBXJvKVp, xgjemqjKTNpfypn

SOLUTION:
qjKTNpfy