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

SOLUTION: vlV

PROBLEM: dsngGP, KvnglB

SOLUTION: ng

PROBLEM: ysTmyWZ, zFTmyOd

SOLUTION:
Tmy