using System;

public class TestParams
{
	object this [params string[] idx] {
		get {
			return idx[0];
		}
		set {
			Console.WriteLine (value);
			if ((string)value != "A(B)")
				throw new ApplicationException (value.ToString ());
		}
	}
	
	public void TestMethod ()
	{
		this ["A"] += "(" + this ["B"] + ")";
		this [new string[] {"A"}] += "(" + this ["B"] + ")";
	}
}

public class TestNonParams
{
	object this [string idx] {
		get {
			return idx;
		}
		set {
			Console.WriteLine (value);
			if ((string)value != "A(B)")
				throw new ApplicationException (value.ToString ());
		}
	}
	
	public void TestMethod ()
	{
		this ["A"] += "(" + this ["B"] + ")";
	}
}

public class M
{
	public static int Main()
	{
		new TestNonParams().TestMethod ();
		new TestParams().TestMethod ();
		return 0;
	}
}