using static System.Math;
using System;

public class Hello
{
    public static double a, b, c;
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        a = double.Parse(line[0]);
        b = double.Parse(line[1]);
        c = double.Parse(line[2]);
        getAns();
    }
    static void getAns()
    {
        var ans = 0d;
        if (a == 0 && b == 0 && c == 0) { Console.WriteLine(-1); return; }
        if (a == 0 && b == 0 && c != 0) { Console.WriteLine(0); return; }
        if (a != 0 && b * b == 4 * a * c)
        {
            Console.WriteLine(1);
            ans = -b / 2d / a;
            Console.WriteLine(ans);
            return;
        }
        if (a != 0 && b * b > 4 * a * c)
        {
            Console.WriteLine(2);
            var t = Sqrt((double)b * b - 4d * a * c);
            if (b > 0)
            {
                ans = (-b - t) / 2d / a;
                Console.WriteLine(ans);
                ans = c / a / ans;
                Console.WriteLine(ans);
            }
            else
            {
                var ans1 = (-b + t) / 2d / a;
                var ans2 = c / a / ans1;
                Console.WriteLine(Min(ans1, ans2));
                Console.WriteLine(Max(ans1, ans2));
            }
            return;
        }
        if (a != 0 && b * b < 4 * a * c)
        {
            Console.WriteLine(0);
            return;
        }
        if (a == 0 && b != 0)
        {
            Console.WriteLine(1);
            ans = -(double)c / b;
            Console.WriteLine(ans);
            return;
        }
    }
}