class Human
    {
        public int fullAge;
        public string firstName;
        public string secondName;
        public string gender;

        public void getHumanInfo()
        {
            Console.WriteLine($"This human name is {firstName} {secondName}.");
            if (gender == "woman")
            {
                Console.WriteLine($"She is a {fullAge} years old");
            }
            else if (gender == "man")
            {
                Console.WriteLine($"He is a {fullAge} years old");
            }
            else
                Console.WriteLine($"Gender is indefined. It is a {fullAge} years old");
        }
    }

    class Teacher : Human
    {
        public int experience;
        public int hoursInWeek;
        public string subject;
        private float salary;

    }

    class Pupil : Human
    {
        public int form;
        public char formLetter;
    }

    class Parent : Human
    {
        private int howMuchCldr;
        private float salary;
    }

    class Worker : Teacher
    {
        public string position;
    }

    class Program
    {
        static void Main(string[] args)
        {
            Human Alisa = new Human();
            Alisa.firstName = "Alisa";
            Alisa.secondName = "Beznis";
            Alisa.gender = "woman";
            Alisa.fullAge = 15;

            Alisa.getHumanInfo();
        }
    }
}