using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        var rng = new Random();

        var num = rng.Next(100000, 500001);

        var sb = new StringBuilder();

        var s = num.ToString();

        sb.Append(s[0] + ",");

        for(int i = 1; i < s.Length; i++)

            sb.Append(s[i]);

        Console.WriteLine(sb.ToString());

    }

}