using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
using System.Runtime.Intrinsics.Arm;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var p = NList;
        var (a, b, c) = (p[0], p[1], p[2]);
        if (a == 0)
        {
            if (b == 0)
            {
                if (c == 0) WriteLine(-1);
                else WriteLine(0);
            }
            else
            {
                WriteLine(1);
                WriteLine(- (double)c / b);
            }
        }
        else
        {
            if (b == 0)
            {
                if (c == 0)
                {
                    WriteLine(1);
                    WriteLine(0);
                }
                else if (c > 0)
                {
                    WriteLine(0);
                }
                else
                {
                    WriteLine(2);
                    var ans = Math.Sqrt((double) c / a);
                    WriteLine(-ans);
                    WriteLine(ans);
                }
            }
            else
            {
                if (c == 0)
                {
                    var ans = - (double) b / a;
                    WriteLine(Math.Min(0, ans));
                    WriteLine(Math.Max(0, ans));
                }
                else
                {
                    var center = - b / 2.0 / a;
                    if (a * center * center + b * center + c == 0)
                    {
                        WriteLine(1);
                        WriteLine(center);
                    }
                    else if ((a > 0 && a * center * center + b * center + c > 0) || (a < 0 && a * center * center + b * center + c < 0))
                    {
                        WriteLine(0);
                    }
                    else
                    {
                        var max = 4_000_000_000.0;
                        double ans1;
                        var d = 0.000_000_000_000_1;
                        var left = -max;
                        var right = center;
                        while (right - left > d && Math.Abs((right - left) / right) > d)
                        {
                            var mid = (left + right) / 2;
                            if (a > 0)
                            {
                                if (a * mid * mid + b * mid + c > 0) left = mid;
                                else right = mid;
                            }
                            else
                            {
                                if (a * mid * mid + b * mid + c < 0) left = mid;
                                else right = mid;
                            }
                        }
                        ans1 = left;
                        left = center;
                        right = max;
                        while (right - left > d && Math.Abs((right - left) / right) > d)
                        {
                            var mid = (left + right) / 2;
                            if (a > 0)
                            {
                                if (a * mid * mid + b * mid + c < 0) left = mid;
                                else right = mid;
                            }
                            else
                            {
                                if (a * mid * mid + b * mid + c > 0) left = mid;
                                else right = mid;
                            }
                        }
                        WriteLine(2);
                        WriteLine(ans1.ToString("0.000000000000"));
                        WriteLine(left.ToString("0.000000000000"));
                    }
                }
            }
        }
    }

}