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);
        
        var b = a.OrderByDescending(num => num).ToArray();

        Int64 minDiff = Math.Abs(b[0] - b[n - 1]);

        for (int i = 0; i < (n - 1); i++)
        {
            if (minDiff > Math.Abs(b[i] - b[i + 1]))
            {
                minDiff = Math.Abs(b[i] - b[i + 1]);
            }
        }

        Console.WriteLine(minDiff);
        
    }
}