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

SOLUTION: Qz

PROBLEM: KfjqnJLciTXqkJK, yqfRcfqnJLcisSB

SOLUTION: qnJLci

PROBLEM: SavNvTyLuod, fZzNvTyLuRGI

SOLUTION:
NvTyLu