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: HiGmCdXrmFRJYWLvZbpU, IxhkrmFRJYWLvZLaqRVxPkL

SOLUTION: rmFRJYWLvZ

PROBLEM: IPIJYTYIVhCJfrffbdmIgP, PqkaYTYIVhCJfrdGdEZTH

SOLUTION:
YTYIVhCJfr