using System;

​

public class Person

{

    public string Name { get; set; }

    public int Age { get; set; }

    public Person(string name, int age) {

        Name = name;

        Age = age;

    }

    public virtual string Describe() => $"Name: {Name}, Age: {Age}";

    public string Describe(string str)

    {

        return $"new {str}";

    }

}

​

public class Student : Person

{

    public string School { get; set; }

    public Student(string name, int age, string school) : base(name, age) 

    {

        School = school;

    }

    public override string Describe() => $"{base.Describe()}, School: {School}";

}

​

public class Program

{

    public static void Main()

    {

        Person person = new Person("Alice", 30);

        Student student = new Student("Bob", 20, "University");

​

        Console.WriteLine(person.Name);

        Console.WriteLine(student.Name);

        Console.WriteLine(person.Describe());

        Console.WriteLine(student.Describe());

        Console.WriteLine(person.Describe("test text"));

    }

}