using static System.Math;
using System;

public class Hello
{
    public static void Main()
    {
        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 = 10000000;
        for (int i = 1; i < n; i++)
            if (a[i] != a[i - 1]) ans = Min(ans, a[i] - a[i - 1]);
        Console.WriteLine(ans == 10000000 ? 0 : ans);
    }
}