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

SOLUTION: HMpUYADGfE

PROBLEM: hVQJkZyKfPoOQEukfAbXDpB, qpojyxWkZyKfPoOQEZkUI

SOLUTION: kZyKfPoOQE

PROBLEM: GwvmQpdovbkIWOaup, KiywQdovbkIhsF

SOLUTION:
dovbkI