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);
        int min = 2147483647;
        // your code goes here
        Array.Sort(a);
        for(int i = 0; i < n-1; i++){
            int diff = a[i] - a[i+1];
            if(diff < 0){
                diff *= -1; 
            }
            if(diff < min){
                min = diff;
            }
        }
        Console.WriteLine(min);
    }
}