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

    }
}