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

Input: Consider Input: nFgMXUzpStDAybiwm, aNJrXUzpStDjp

Output: XUzpStD


Input: Consider Input: iwSQnplQZFbXQ, lHWnplQZFzswgU

Output: nplQZF


Input: Consider Input: yRhGVkSKiutUZKgMfsH, DyTwSKiutUZKgTFPApvL


Output: SKiutUZKg