using System;
public class Program
{
    public static void Main()
    {
        int num = int.Parse(Console.ReadLine() ?? string.Empty);
        string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        int[] ints = new int[num];

        for (int i = 0; i < num; i++)
        {
            ints[i] = int.Parse(str[i]);
        }

        Array.Sort(ints);
        int a = 0;
        for (int i = ints.Length - 1; i > 0; i--)
        {
            if(ints[i] == ints[i - 1])
            {
                continue;
            }
            if (a == 0)
            {
                a = ints[i] - ints[i-1];
                continue;
            }
            int b = ints[i] - ints[i - 1];
            if(a > b)
            {
                a = b;
            }

        }
        Console.WriteLine(a);

    }
}