Description: Ksusha is a beginner coder. Today she starts studying arrays. She has array a1, a2, ..., an, consisting of n positive integers. Her university teacher gave her a task. Find such number in the array, that all array elements are divisible by it. Help her and find the number! Input Format: The first line contains integer n (1 ≤ n ≤ 105), showing how many numbers the array has. The next line contains integers a1, a2, ..., an (1 ≤ ai ≤ 109) — the array elements. Output Format: Print a single integer — the number from the array, such that all array elements are divisible by it. If such number doesn't exist, print -1. If there are multiple answers, you are allowed to print any of them. Note: None