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

Input: Consider Input: iwSQnplQZFbXQ, lHWnplQZFzswgU

Output: nplQZF


Input: Consider Input: VpJvIZdkzKovjc, BZEizZdkzKYZ

Output: ZdkzK


Input: Consider Input: gFZNECIHQrPaO, MhECIHQQm


Output: ECIHQ