using System;
using System.IO;

namespace Ulyanov_Abstract
{
    abstract class Person
    {
        public string Name;
        public int Birthdate;
        public string Faculty;

        public char Attach;

        abstract protected void print();
        abstract protected int getAge();
        protected bool CompareTo(ref Person arg1, ref Person arg2)
        {
            return arg1.Birthdate < arg2.Birthdate;
        }

        static public Person[] readFromFile(string inputFileName)
        {
            FileStream inputFile = new FileStream(inputFileName, FileMode.Open, FileAccess.Read);
            StreamReader inputReader = new StreamReader(inputFile);
            Int32 allocCnt = 0;
            while (inputReader.ReadLine() != null)
            {
                inputReader.ReadLine();
                inputReader.ReadLine();
                inputReader.ReadLine();
                inputReader.ReadLine();
                inputReader.ReadLine();
                allocCnt++;
            }

            Person[] arrPtr = new Person[allocCnt];

            string[] buff = new string[5];

            inputFile.Seek(0, SeekOrigin.Begin);

            for(Int32 i = 0; i < allocCnt; i++)
            {
                buff[0] = inputReader.ReadLine();
                buff[1] = inputReader.ReadLine();
                buff[2] = inputReader.ReadLine();
                buff[3] = inputReader.ReadLine();
                buff[4] = inputReader.ReadLine();

                if ( buff[4] != "n/a" )
                {
                    arrPtr[i] = new Teacher(buff[0], Convert.ToInt32(buff[1]), buff[2], buff[3], buff[4]);
                }
                else if (buff[3] != "n/a")
                {
                    arrPtr[i] = new Student(buff[0], Convert.ToInt32(buff[1]), buff[2], buff[3]);
                }
                else
                {
                    arrPtr[i] = new Applicant(buff[0], Convert.ToInt32(buff[1]), buff[2]);
                }

                inputReader.ReadLine();
            }

            inputFile.Close();

            return arrPtr;
        }
    }

    class Teacher : Person
    {
        public string Position;
        public string Expierence;

        override protected void print()
        {

        }

        override protected int getAge()
        {
            return 0;
        }

        public Teacher(string arg1, Int32 arg2, string arg3, string arg4, string arg5)
        {
            this.Attach = 'T';
            this.Name = arg1;
            this.Birthdate = arg2;
            this.Faculty = arg3;
            this.Position = arg4;
            this.Expierence = arg5;
        }
    }

    class Applicant : Person
    {

        override protected void print()
        {

        }

        override protected int getAge()
        {
            return 0;
        }

        public Applicant(string arg1, Int32 arg2, string arg3)
        {
            this.Attach = 'A';
            this.Name = arg1;
            this.Birthdate = arg2;
            this.Faculty = arg3;
        }
    }

    class Student : Person
    {
        public string Course;

        override protected void print()
        {

        }

        override protected int getAge()
        {
            return 0;
        }

        public Student(string arg1, Int32 arg2, string arg3, string arg4)
        {
            this.Attach = 'S';
            this.Name = arg1;
            this.Birthdate = arg2;
            this.Faculty = arg3;
            this.Course = arg4;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Person.readFromFile("source.txt");
        }
    }
}