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

SOLUTION: tdwLUpClR

PROBLEM: RGImMTISYdkjzMO, pmyfpImMTISYdatLBBFr

SOLUTION: ImMTISYd

PROBLEM: CMVIZhzznJxVnYG, kzZhzznJUrf

SOLUTION:
ZhzznJ