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
        {
            var root = (long)b * b - 4L * a * c;
            if (root < 0)
            {
                WriteLine(0);
            }
            else if (root == 0)
            {
                WriteLine(1);
                WriteLine(- b / 2.0 / a);
            }
            else
            {
                var d = new System.Numerics.BigInteger(1_000_000_000_000);
                var first = -d * b;
                var second = d * d * root;
                var ng = System.Numerics.BigInteger.Zero;
                var ok = d * root;
                while (ok - ng > 1)
                {
                    var mid = (ok + ng) / 2;
                    if (mid * mid >= second) ok = mid;
                    else ng = mid;
                }
                WriteLine(2);
                var ans1 = (first - ok) / 2 / a;
                var ans2 = (first + ok) / 2 / a;
                if (a < 0) (ans1, ans2) = (ans2, ans1);
                if (ans1 < 0)
                {
                    ans1 = -ans1;
                    WriteLine($"-{ans1 / d}.{ans1 % d :000000000000}");
                }
                else
                {
                    WriteLine($"{ans1 / d}.{ans1 % d :000000000000}");
                }
                if (ans2 < 0)
                {
                    ans2 = -ans2;
                    WriteLine($"-{ans2 / d}.{ans2 % d :000000000000}");
                }
                else
                {
                    WriteLine($"{ans2 / d}.{ans2 % d :000000000000}");
                }
            }
        }
    }

}