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

SOLUTION: ns

PROBLEM: kIBDjQLEZepVNHqnKqhine, hTZepVNHqnYTajyzv

SOLUTION: ZepVNHqn

PROBLEM: DFHGPTRwzprTPezDnXwzp, GhHpXLnGEhHGPTRwzprTTZJyUo

SOLUTION:
HGPTRwzprT