
import java.util.Scanner;

public class P20B {
    P20B(){
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();
        sc.close();
        
        double delta = b * b - 4 * a * c;
        
        if (delta < 0){
            System.out.println(-1);
        }
        else if (delta == 0){
            System.out.println(1);
            System.out.println((-1 * b) / (2 * a));
        }
        else {
            System.out.println(2);
            System.out.println((-1 * b - Math.sqrt(delta)) / (2 * a));
            System.out.println((-1 * b + Math.sqrt(delta)) / (2 * a));
        }
    }
    
    public static void main (String []args){
        new P20B();
    }
}
