Error, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Monster
    {
    //public data members
    public string name_;
    public int size_;
    public const legs_ = 2;
        
    //private data members
    private int scare_;
        
    //static data members
    private int nMonsters_;
        
    //default constractor
    public Monster()
    {
    name_ = "default";
    size_ = 10;
    scare_ = 20;
    nMonsters_++;
    }
    
    public Monster(string name, int size, int scare)
    {
     
    name_ = name;
    size_ = size;
    scare_ = scare;
    nMonsters++;
    }
        
    //methods
    public void print()
    {
    Console.WriteLine("Monsters name: " + name_);
    Console.WriteLine("Monsters size: " + size_);
    Console.WriteLine("Momsters scare: " + scare_);
    }
        
    
    public class Program
    {
        public static void Main(string[] args)
        {
            Monster Dinosour = new Monster();
            Console.WriteLine(Dinosour.name_);
            
            Dinosour.name_ = "Rex";
            Console.WriteLine(Dinosour.name_);
            
            //using non-defauld-constractor
            Monster Dragon = new Monster("Drako", 30, 25);
            Console.WriteLine(Monster.nMonsters_);
            
            Monster Zombie = new Monster("Zombie", 6, 8);
            Zombie.print();
            Dragon.print();
            Dinosour.print();
            
            Console.WriteLine(Monster.nMonsters_);
            
        }
        
        
      
    }
}

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