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

Input: Consider Input: sJRFPufsaWXNeu, AePufsafc

Output: Pufsa


Input: Consider Input: QECPAHsg, bUfPAHOWb

Output: PAH


Input: Consider Input: aBIhVTphEKvSukceVnI, jGeBJlphEKvSuyau


Output: phEKvSu