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
        Array.Sort(a);
        long minAbs = 0;
        for(int i = 0 ;i<n-1;i++)
            {
            long abs = Math.Abs(a[i+1] - a[i]);
            if(i == 0)
                {
                minAbs = abs;
            }
            if(abs < minAbs)
                {
                minAbs = abs;
            }
        }
        Console.WriteLine(minAbs);
    }
}