import java.lang.reflect.*;

public class Finterface {
	public static void main(String str[]){
	Class cls = java.util.List.class;
	Class[] intfs = cls.getInterfaces();
	int len = intfs.length;
	for (int i =0; i < len; i++)
	{
	System.out.println(intfs[i]);
	}

	}
}