In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Input: Consider Input: TnbLNKnNSs, NhDLNKnNRd

Output: LNKnN


Input: Consider Input: bSBuJiZniSlZtO, AcuJiZniSRAOAv

Output: uJiZniS


Input: Consider Input: BbjssiIZTNlzknFne, QfTIYssiIZTNGmppts


Output: ssiIZTN