import java.io.BufferedOutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringReader;
import java.util.Arrays;
import java.util.Scanner;

public class Main {
    private Scanner in;
    private PrintWriter out;
    
    public void solve()
    {
        double a = ni();
        int ai = (int)a;
        double b = ni();
        int bi = (int)b;
        double c = ni();
        int ci = (int)c;
        if(a != 0){
            double d = b * b - 4 * a * c;
            int di = bi * bi - 4 * ai * ci;
            if(d > 0){
                out.println(2);
                //if(ai > 0){
                    out.printf("%1.6f\n", (-b - Math.sqrt(d)) / (2 * a));
                    out.printf("%1.6f\n", (-b + Math.sqrt(d)) / (2 * a));
//              }else{
//                  out.printf("%1.6f\n", (-b + Math.sqrt(d)) / (2 * a));
//                  out.printf("%1.6f\n", (-b - Math.sqrt(d)) / (2 * a));
//              }
            }else if(d == 0){
                out.println(1);
                out.printf("%1.6f\n", -b / (2 * a));
            }else{
                out.println(0);
            }
        }else if(b != 0){
            out.println(1);
            out.printf("%1.6f\n", -c / b);
        }else if(c != 0){
            out.println(0);
        }else{
            out.println(-1);
        }
    }
    
    public void run() throws Exception
    {
//      in = new Scanner(new StringReader("1 -5 6"));
        in = new Scanner(System.in);
        // System.setOut(new PrintStream(new BufferedOutputStream(System.out)));
        out = new PrintWriter(System.out);
        
//      int n = in.nextInt();
        int n = 1;
        for(int i = 1;i <= n;i++){
            long t = System.currentTimeMillis();
            solve();
            out.flush();
//          System.err.printf("%04d/%04d %7d%n", i, n, System.currentTimeMillis() - t);
        }
    }
    
    
    public static void main(String[] args) throws Exception
    {
        new Main().run();
    }
    
    private int ni() { return Integer.parseInt(in.next()); }
    private static void tr(Object... o) { System.out.println(o.length == 1 ? o[0] : Arrays.toString(o)); }
    private void tra(int[] a) {System.out.println(Arrays.toString(a));}
    private void tra(int[][] a)
    {
        for(int[] e : a){
            System.out.println(Arrays.toString(e));
        }
    }
    
}