using System;

public class Program

{

    public static void Main()

    {

        var str = " Hello World ";

        var str2 = "My name is Pao. My nickname is Naja";

        var s ="";

        var s2 ="";

        for(var i = 0 ; i < str.Length ; i++){

            if(str[i].ToString() != " "){

                s += str[i];

            }else{

                if(s.Length == 5){

                    s += str[i];

                }

            }

        }

        for(var i = 0 ; i< str2.Length ; i++){

            if(str2[i].ToString() == "M"){

                s2 += "H";

            }else if(str2[i].ToString() == "y"){

                s2 += "i";}

            else{

                s2 += str2[i];

            }

        }

        Console.WriteLine(s);

        Console.WriteLine(s2);

    }

}