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()), i, minDiff = int.MaxValue, diff;
        string[] a_temp = Console.ReadLine().Split(' ');
        int[] a = Array.ConvertAll(a_temp,Int32.Parse);
        // your code goes here
        
        a = a.OrderBy(x => x).ToArray();
        for(i = 0; i < n - 1; i++)
        {
            diff = Math.Abs(a[i] - a[i + 1]);
            minDiff = minDiff < diff ? minDiff : diff;
        }
        Console.WriteLine(minDiff);
    }
}