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);
            Array.Sort(a);
            int minDiff = a[1] - a[0];
            for (int i = 2; i != a.Length; i++)
            {
                minDiff = Math.Min(minDiff, a[i] - a[i - 1]);
            }
            Console.WriteLine(minDiff);
            Console.ReadLine();
    }
}