// Page 168

import java.util.Scanner;
public class Prog_12_1
{
	public static void main(String[] args)
	{
		Scanner input=new Scanner(System.in);
		List z = new List();
		int item;
		while (input.hasNext())
		{
			item = input.nextInt();
			z.Insert (item);
		}
		System.out.println(z.Length());
		z.Print ();
	}
}