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

SOLUTION: Eh

PROBLEM: ptVlCwpfOZIi, QEdyVlCwpfOwp

SOLUTION: VlCwpfO

PROBLEM: atVivsGJ, ipVivyDi

SOLUTION:
Viv