using System;

public class Test
{
	public static void Main()
	{
		// your code goes here
	}
	
	interface Parent {}
	
	interface Child : Parent {}
	
	interface A 
	{
		T h<T>() where T : Parent;
	}
	
	interface B : A 
	{
		T h<T>() where T : Child;
	}
}