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

Input: Consider Input: CzkPtkpMTDeNZwCPbJJn, HzpMVDeNZwCPbJVOU

Output: DeNZwCPbJ


Input: Consider Input: QECPAHsg, bUfPAHOWb

Output: PAH


Input: Consider Input: pUUeECm, bhBUeEjUI


Output: UeE