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

SOLUTION: QIgrxaZm

PROBLEM: HiEuutntEBpU, fdkqEuutntEBABdGZRND

SOLUTION: EuutntEB

PROBLEM: EwAoeTNPvK, yreTNPQVpP

SOLUTION:
eTNP