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

SOLUTION: gfNvnquxI

PROBLEM: HSsyZzZLZAAq, MFEZzZLJC

SOLUTION: ZzZL

PROBLEM: DVybzJwA, laybzJHuK

SOLUTION:
ybzJ