using System;

namespace ProblemAB
{
	class User
	{
		static void Main()
		{			
			AB ab1 = new AB();
			AB ab2 = new AB( 20 );

			ab1.B = 10;
			
			Console.WriteLine( "The value of a is {0}.", ab1.A );
			Console.WriteLine( "The value of ab1's b is {0}", ab1.B );
			Console.WriteLine( "The value of ab2's b is {0}", ab2.B );
		}
	}

	class AB
	{
		private static int a = 0;
		private int b;

		// Constructors
		public AB()
		{
			b = a;			
		}
		public AB(int valueIn)
		{
			b = valueIn;
		}

		// Properties -- aka accessors and modifiers
		public int B // B is an accessor and modifier
		{
			get
			{
				return b;
			}
			set
			{
				b = value;
			}
		}
		public int A // A is an accessor only
		{
			get
			{
				return a;
			}
		}
	}
}