What is the output of the following program code?

abstract class C1{
	public C1(){ 
		System.out.print(1); 
	} 
} 
class C2 extends C1{ 
	public C2(){ 
		System.out.print(2); 
	} 
} 
class C3 extends C2{ 
	public C3(){ 
		System.out.println(3); 
	} 
} 
public class Test{ 
	public static void main(String[] a){ 
		new C3(); 
	} 
}