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

SOLUTION: TnWqkLqY

PROBLEM: DUhUbmfLuOFAQann, kwnzfLuOFAErR

SOLUTION: fLuOFA

PROBLEM: qnFhGmvVYXTFXjnMmP, KtTezVYXTFXjnCykp

SOLUTION:
VYXTFXjn