using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
using static System.Math;
using static System.Array;
using static AtCoder.Tool;
namespace AtCoder
{
    class AC
    {
        const int MOD = 1000000007;
        const int INF = int.MaxValue / 2;
        const long SINF = long.MaxValue / 2;
        const double EPS = 1e-8;
        static readonly int[] dI = { 0, 1, 0, -1 };
        static readonly int[] dJ = { 1, 0, -1, 0 };
        //static List<List<int>> G = new List<List<int>>();
        //static List<List<Edge>>G = new List<List<Edge>>();
        //static List<Edge> E = new List<Edge>();
        static void Main(string[] args)
        {
            //var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            //Console.SetOut(sw);
            var cin = new Scanner();

            var input = cin.ReadSplitInt();
            var aa = input[0];
            var bb = input[1];
            var cc = input[2];
            var D = bb * bb - 4 * aa * cc;

            var a = (decimal)aa;
            var b = (decimal)bb;
            var c = (decimal)cc;
            if (aa == 0)
            {
                if (bb != 0)
                {
                    Console.WriteLine(1);
                    Console.WriteLine(-b / c);
                    return;
                }
                if (cc == 0)
                {
                    Console.WriteLine(-1);
                    return;
                }
                Console.WriteLine(0);
                return;
            }
            var X = -(b / (2 * a));
            
            if (D == 0) { Console.WriteLine(1); Console.WriteLine(X);return; }
            if (D < 0) { Console.WriteLine(0);return; }
            var k = b * b - 4 * a * c;
            decimal l = 0;
            decimal r = (decimal)1e11;
            while (r - l > (decimal)1e-12)
            {
                decimal mid = (l + r) / 2;
                if (mid * mid > k) { r = mid; }
                else { l = mid; }
            }
            decimal Y = l / (2 * a);
            Console.WriteLine(2);
            var X1 = Min(X - Y, X + Y);
            var X2 = Max(X - Y, X + Y);
            Console.WriteLine($"{X1}\n{X2}");
            

            //Console.Out.Flush();
        }
        struct Edge
        {
            public int from;

            public int to;
            public long dist;
            public Edge(int t, long c)
            {
                from = -1;
                to = t;
                dist = c;
            }
            public Edge(int f, int t, long c)
            {
                from = f;
                to = t;
                dist = c;
            }

        }
    }
    public class Scanner
    {
        public int[] ReadSplitInt()
        {
            return ConvertAll(Console.ReadLine().Split(), int.Parse);
        }
        public long[] ReadSplitLong()
        {
            return ConvertAll(Console.ReadLine().Split(), long.Parse);
        }
        public double[] ReadSplit_Double()
        {
            return ConvertAll(Console.ReadLine().Split(), double.Parse);
        }
    }
    public static class Tool
    {
        static public void Initialize<T>(ref T[] array, T initialvalue)
        {
            for (var i = 0; i < array.Length; i++)
            {
                array[i] = initialvalue;
            }
        }
        static public void Swap<T>(ref T a, ref T b)
        {
            T keep = a;
            a = b;
            b = keep;
        }

        static public void Display<T>(T[,] array2d, int n, int m)
        {
            for (var i = 0; i < n; i++)
            {
                for (var j = 0; j < m; j++)
                {
                    Console.Write($"{array2d[i, j]} ");
                }
                Console.WriteLine();
            }
        }

        static public long LPow(int a, int b)
        {
            return (long)Pow(a, b);
        }
    }
}