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
        
        //O(n) loop
        
        int value = Int32.MaxValue;
        Array.Sort(a);
        
        for(int i = 1; i < n; i++) {
            if(Math.Abs(a[i - 1] - a[i]) < value)
                value = Math.Abs(a[i - 1] - a[i]);
        }
        
        Console.WriteLine(value);
    }
}