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
        a = a.OrderBy(t=>t).ToArray();
        
        var minDiff = int.MaxValue;
        for(var i=0;i<a.Length-1;++i){
            int diff = Math.Abs(a[i]-a[i+1]);
            if (diff <minDiff){
                minDiff=diff;
            }
        }
        Console.WriteLine(minDiff);
    }
}