using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
        string[] a_temp = Console.ReadLine().Split(' ');
        int[] a = Array.ConvertAll(a_temp,Int32.Parse);
        // your code goes here
        
        Array.Sort(a);

            int min = Math.Abs(a[0] - a[1]);
            for (int i = 0; i < n-1; i++)
            {
                int x = Math.Abs(a[i] - a[i + 1]);
                min = x < min ? x : min;
            }

            Console.WriteLine(min);
    }
}