using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        int n = int.Parse(Console.ReadLine());
        int[] x = Console.ReadLine().Split().Select(xx => int.Parse(xx)).ToArray();
        Array.Sort(x);
        double min = Math.Pow(10, 5) + 1;

        for (int i = 1; i < n; i++)
        {
            if (x[i] == x[i - 1])
            {
                continue;
            }

            if (x[i] - x[i - 1] < min)
            {
                min = x[i] - x[i - 1];
            }
        }

        if (min == Math.Pow(10, 5) + 1)
        {
            min = 0;
        }

        Console.WriteLine(Math.Abs((int)min));
        Console.Read();
    }
}