using System;
using System.Drawing;

public static class Extend
{
    public static string ToAnswer(this Point p)
    {
        return $"{p.X} {p.Y}";
    }
}

public class Solution
{
    public static int GetDistance(Point p)
    {
        Console.WriteLine(p.ToAnswer());
        return int.Parse(Console.ReadLine());
    }

    public static void Main()
    {
        Point result = new Point(0, 0);
        var d0 = GetDistance(new Point(0, 0));
        if (d0 != 0)
        {
            var d1 = GetDistance(new Point(d0, 0)) / 2;
            result = new Point(d0 - d1, d1);
        }

        Console.WriteLine(result.ToAnswer());
    }
}