{}
using System;
public abstract class Walls
{
public abstract void Material();
public abstract void Durability();
}
public class Marble: Walls
{
public int Strength;
public override void Material()
{
Console.WriteLine("Material: " + "Marbles");
}
public override void Durability()
{
Console.WriteLine("Durability: " + "Very hard");
}
}
public class Program
{
public static void Main(string[] args)
{
Marble myMarble = new Marble();
myMarble.Strength = 14;
myMarble.Material();
myMarble.Durability();
}
}