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
        Console.WriteLine(FindMinAbsDiff(a, n));
    }
    
    static int FindMinAbsDiff(int[] a, int n) {
        Array.Sort(a);
        var minAbsDiff = int.MaxValue;
        var prev = a[0];
        for(var i =1; i < n; i++) {
            minAbsDiff = Math.Min(Math.Abs(a[i] - prev), minAbsDiff);
            prev = a[i];
        }
        return minAbsDiff;
    }
}