using System;
namespace P5_4
{
    public class Student
    {
        public string S_name; 
        protected int S_age; 
        protected  string  S_number; 
        public Student() 
        { 
            S_name = "Unknown"; 
            S_age = 18;
            S_number ="201108501"; 
        } 
    }
    class Program
    {
        static void Main()
        {
            Student stu1;			    
            stu1 = new Student();		
            Console.WriteLine(stu1 .S_name);
            Console.ReadLine();
        }
    }
}
