using static System.Math;
using System;

public class Hello
{
    public static void Main()
    {
        var MAX = 10000000;
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        Array.Sort(a);
        var ans = MAX;
        for (int i = 1; i < n; i++)
        {
            var w = a[i] - a[i - 1];
            if (w != 0) ans = Min(ans, w);
        }
        Console.WriteLine(ans == MAX ? 0 : ans);
    }
}