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());
        var myListTest = Console.ReadLine().Split(' ');
        var myList = new List<int>();
        for (int i = 0; i < myListTest.Length; i++)
        {
            myList.Add(Convert.ToInt32(myListTest[i]));
        }
        myList.Sort();

        int min = Int32.MaxValue;
        for (int i = 0; i < myList.Count-1; i++)
        {
            int abs = Math.Abs(myList[i] - myList[i+1]);
            if (abs < min)
            {
                min = abs;
            }
        }

        Console.WriteLine(min);
    }
}