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

SOLUTION: gIkjNk

PROBLEM: iYSNsY, HSSNhP

SOLUTION: SN

PROBLEM: kjWUSusrynbU, aKiUSusrJLbQ

SOLUTION:
USusr