using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp4
{
    class User
    {
        private string name;
        private string surname;
        private string patronymic;

        private int age;
        double error;





        public String Name
        {
            set
            {
                name = value;
            }
            get
            {
                if (String.IsNullOrEmpty(name) || double.TryParse(name, out error))
                {
                    Console.Write("  This is not name!  ");
                    return name = "undifined";
                }
                else
                    return name;
            }
        }
        public String Surname
        {

            set
            {
                surname = value;
            }
            get
            {
                if (String.IsNullOrEmpty(surname) || double.TryParse(name, out error))
                {
                    Console.Write("  This is not surname!  ");
                    return surname = "undifined";
                }
                return surname;
            }
        }

        public String Patronymic
        {
            set
            {
                patronymic = value;
            }
            get
            {
                if (String.IsNullOrEmpty(patronymic) || double.TryParse(name, out error))
                {
                    Console.Write("  This is not patronymic!  ");
                    return patronymic = "undifined";
                }
                else
                    return patronymic;
            }
        }


        public int Age
        {
            set
            {
                age = value;
            }
            get
            {
                if (age < 18)
                {
                    Console.Write("   (this user is peezduk!)    ");
                    return age;
                }
                else return age;
            }
        }


    }
}