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

SOLUTION: zJCdAQzU

PROBLEM: DGvUCrUVlUnQBShkWnfnceGasvI, NfzGUnQBShkWnpLMnY

SOLUTION: UnQBShkWn

PROBLEM: JjEQVKijeyEQ, dwSVKijeywCTvb

SOLUTION:
VKijey