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

SOLUTION: zz

PROBLEM: OgWFOfjNYmXVjBBvOdunIc, eGljKGnzFKFOfjNYmXVjdlqsT

SOLUTION: FOfjNYmXVj

PROBLEM: RLuggNnETdbYZQtHznaWO, lbfFNTAtVTdbYZQtHzLLv

SOLUTION:
TdbYZQtHz