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