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);
        Array.Sort(a);
        
        var min = Int32.MaxValue;
        for(var i = 0; i < a.Length - 1; ++i)
        {
            min = Math.Min(min, Math.Abs(a[i] - a[i + 1]));
        }
        Console.WriteLine(min);
    }
}