using System;

public class Program

{

    public static void Main()

    {

        DateTime dt = new DateTime(2010,10,11);

          String txtDate=dt.ToString();

        string strDate = txtDate.Substring(6, 4) + "-" +

    txtDate.Substring(3, 2) + "-" +

    txtDate.Substring(0, 2);

        Console.WriteLine( strDate);

    }

}