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);
        List<int> lis = new List<int>();
        for (int i=0;i<n;i++)
        {
            int number = a[i];
            lis.Add(number);
        }
    
        lis.Sort();
        int difference = 0;
        int mindiff = 0;
        
        for (int i=0;i<n-1;i++)
            {
            
            int num1 = lis[i];
                int num2 = lis[i+1];
                difference =Math.Abs(num1-num2);
            if (i ==0)
                {mindiff = difference;}
                if (difference< mindiff)
                    {mindiff = difference;}
            }
        
        Console.WriteLine(mindiff);
    }
}