using System;

using System.Reflection;

public class Program

{

    public bool dupa1 {get;set;}

    public bool dupa2 {get;set;}

    public int dupa3{get;set;}

    public bool dupa4 {get;set;}

    public static void Main()

    {

        foreach(PropertyInfo prop in typeof(Program).GetProperties())

        {

            if(prop.PropertyType==typeof(System.Boolean)){

                Console.WriteLine(prop.Name);

            }

        }

    }

}