using System;
using System.Linq;

class Program
{
    public void Solve()
    {
        int ans = 0;
        int N = int.Parse(Console.ReadLine());
        int[] X = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();

        Array.Sort(X);

        for (int i = 0; i < N - 1; i++)
        {
            if (X[i] == X[i + 1]) { continue; }

            if (ans == 0 || Math.Abs(X[i] - X[i + 1]) < ans) { ans = Math.Abs(X[i] - X[i + 1]); }
        }
        Console.WriteLine(ans);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}