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 = Int32.MaxValue;
        
        Array.Sort(a);
        
        for(int i = 0; i < a.Length - 1; ++i) {
            int diff = Math.Abs(a[i] - a[i + 1]);
            if(diff < min) {
                min = diff;
            }
        }
        
        Console.WriteLine(min);
        
        /*
        for(int i = 0; i < a.Length - 1; ++i) {
            for(int j = i + 1; j < a.Length; ++j) {
                //int diff = Math.Abs(a[i] - a[j]); 
                int diff = a[i] - a[j];
                int squared = diff * diff;
                if(squared < min) {
                    min = squared;
                }
            }
        }
        */
        
        //Console.WriteLine(Math.Sqrt(min));
    }
}