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

SOLUTION: ty

PROBLEM: vMYfFo, EHYfnP

SOLUTION: Yf

PROBLEM: rTImXiooDSVYqkF, gLjnuImXiooDSVYUGuDZgwT

SOLUTION:
ImXiooDSVY