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);
        int min = 1000000000;
			int val = 0;
			for (int i = 0; i < n-1; i++)
			{
					val = Math.Abs(a[i] - a[i+1]);
					if (val < min)
						min = val;
			}
        
        Console.WriteLine(min);
	}
}