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

SOLUTION: qq

PROBLEM: dlzequypR, Puequqv

SOLUTION: equ

PROBLEM: CVArXDapFoXEEGDIA, lvrXDapFoXErWQd

SOLUTION:
rXDapFoXE