import java.io.*;



public class name

{

    public static void main (String []args)

        throws IOException

    {

        System.out.print ("Enter your name in format [First Middle Last]: ");



        InputStreamReader reader =

            new InputStreamReader (System.in);



        BufferedReader input =

            new BufferedReader (reader);



        String name = input.readLine ();



        int first_space = name.indexOf (' ');



        String first_name = name.substring (0, first_space);



        int second_space = name.indexOf (' ', first_space + 1);



        String middle_name = name.substring (first_space + 1, second_space);



        String last_name = name.substring (second_space + 1);



        System.out.println (last_name + ", " +

                            first_name + " " +

                            middle_name.charAt (0) + ".");



    }

}