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

SOLUTION: qomxFcL

PROBLEM: bOvlVNWf, iivlVzWt

SOLUTION: vlV

PROBLEM: aaCtSTZjoxQygbZCgd, JsAsLtSTZjoxQyXlDzHCnV

SOLUTION:
tSTZjoxQy