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

SOLUTION: oTbXIiXDp

PROBLEM: dsngGP, KvnglB

SOLUTION: ng

PROBLEM: FqjhyARMn, TvhyAvfK

SOLUTION:
hyA