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

SOLUTION: rkftKkz

PROBLEM: JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH

SOLUTION: ILNeNQbJy

PROBLEM: eYSgLF, FxSgfT

SOLUTION:
Sg