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

SOLUTION: pAquDJFKcN

PROBLEM: sbQJFbUtmnKaEJePFPeRM, QzfvkdZbUtmnKaEJNrWD

SOLUTION: bUtmnKaEJ

PROBLEM: vZwOLPDnaDfIMVYj, UTarVHrwOLPDnaqKV

SOLUTION:
wOLPDna