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

SOLUTION: ESAVHZk

PROBLEM: QjDQjzAIsnYgNmmetl, vyqDQjzAIsnNajYEheP

SOLUTION: DQjzAIsn

PROBLEM: eQcNUzsUalANrvVkpqaDm, KrRQMYUzsUalANrae

SOLUTION:
UzsUalANr