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
        var min = int.MaxValue;
        Array.Sort(a);
        for (int i = 1; i < a.Length; i++)
        {
            min = Math.Min(min, Math.Abs(a[i - 1] - a[i]));
        }
        Console.WriteLine(min);

    }
}