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 minAbsDif = a[1] - a[0];
        
        for (int i = 2; i < n; i++)
        {
            int absDif = a[i] - a[i-1];
            if (absDif < minAbsDif) minAbsDif = absDif;
        }
        
        Console.WriteLine(minAbsDif);
    }
}