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[] orderedA = a.OrderBy(i => i).ToArray();
        List<int> listDiff = new List<int>();
        for (int j = 0; j < n-1; j++)
        {
            listDiff.Add(Math.Abs(orderedA[j + 1] - orderedA[j]));
        }

        Console.Write(listDiff.OrderBy(cnt => cnt).First());
    }
}