import java.io.*;
import java.math.*;
import java.util.*;

/**
 * 
 * @author Togrul Gasimov (ttogrul30@gmail.com)
 *         Created on 06.09.2013
 */

public class Main {
	public static void main(String[] args) /*throws FileNotFoundException*/ { 
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		FastScanner in = new FastScanner(inputStream);
		FastPrinter out = new FastPrinter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(1, in, out);
		out.close();
	}
}

class TaskA{
     
	public void solve(int testNumber, FastScanner scan, FastPrinter out) /*throws FileNotFoundException*/ {
		//Scanner sscan = new Scanner(new File("input.txt"));
		//PrintStream oout = new PrintStream(new File("output.txt"));
	    double a = scan.nextDouble(), b = scan.nextDouble(), c = scan.nextDouble();
	    double d, x1, x2;
	    d = b * b - 4 * a * c;
	    
	    if(d < 0){
	    	out.println(-1);
	    }else if(d == 0){
	    	System.out.println(1);
	       System.out.printf(Locale.US, "%.10f\n", (-b) / (2 * a));
	    }else{
	    	System.out.println(2);
	    	 System.out.printf(Locale.US, "%.10f\n", (-b - Math.sqrt(d)) / (2 * a));
	    	 System.out.printf(Locale.US, "%.10f\n", (-b + Math.sqrt(d)) / (2 * a));
	    }
		//sscan.close();
		//oout.close();
	}
}

class FastScanner extends BufferedReader {
	public FastScanner(InputStream is) {
		super(new InputStreamReader(is));
	}
	
	public int read() {
		try{
			int ret = super.read();
			return ret;
		}catch(Exception e){
			throw new InputMismatchException();
		}
	}
	
	public String next() {
        StringBuilder sb = new StringBuilder();
        int c = read();
        while (isWhiteSpace(c)) {
            c = read();
        }
        if (c < 0) {
            return null;
        }
        while (c >= 0 && !isWhiteSpace(c)) {
            sb.appendCodePoint(c);
            c = read();
        }
        return sb.toString();
    }
	
	static boolean isWhiteSpace(int c) {
        return c >= 0 && c <= 32;
    }
	
	public int nextInt() {
        int c = read();
        while (isWhiteSpace(c)) {
            c = read();
        }
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        int ret = 0;
        while (c >= 0 && !isWhiteSpace(c)) {
            if (c < '0' || c > '9') {
                throw new NumberFormatException("digit expected " + (char) c
                        + " found");
            }
            ret = ret * 10 + c - '0';
            c = read();
        }
        return ret * sgn;
    }
	
	public long nextLong() {
		return Long.parseLong(next());
	}
	
	public double nextDouble() {
		return Double.parseDouble(next());
	}
	
	public BigInteger nextBigInteger() {
		return new BigInteger(next());
	}
	
	public BigDecimal nextBigDecimal(){
		return new BigDecimal(next());
	}
	
	public String readLine(){
		try{
			return super.readLine();
		}catch(IOException e){
			return null;
		}
	}
}

class FastPrinter extends PrintWriter {
	
	public FastPrinter(OutputStream out) {
		super(out);
	}
	public FastPrinter(Writer out) {
		super(out);
	}
}
