using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("please enter your first name");

        string fn=Console.ReadLine();

        int x=fn.Length;

        Console.WriteLine("the length of the fn is: "+ x);

        int z=fn.IndexOf("a");

        Console.WriteLine("the place of the letter a is: "+ z);

        fn.ToUpper();

        Console.WriteLine(fn);

        Console.WriteLine("please enter your last name");

        string ln=Console.ReadLine();

        int y=ln.Length;

        Console.WriteLine("the length of the ln is: "+ y);

        int l=ln.IndexOf("a");

        Console.WriteLine("the place of the letter a is: "+ l);

        ln.ToUpper();

        Console.WriteLine(ln);

        Console.WriteLine(fn + ln);

    }

}

​