using System;

public class Program

{

    public static void Main()

    {

        string name="yanatip";

        Console.WriteLine("A"+"B");

        Console.WriteLine("My name is"+" "+name+" "+"I am"+" "+17+"year old");

        Console.WriteLine("My name is {0}. I am {1} year old",name,17);

        Console.WriteLine("{0,9:f}",123456789);

        Console.WriteLine("{0:f}",123456789);

    }

}