

import java.util.Scanner;

public class B {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        double d = b*b-4*a*c;
        if (a == 0){
            System.out.println(-1);
            return;
        }
        if (d < 0){
            System.out.println(0);
            return;
        }
        double x1 = (-b-Math.sqrt(d))/(2*a);
        double x2 = (-b+Math.sqrt(d))/(2*a);
            System.out.println(2);
            System.out.printf("%.5f",x1);
            System.out.println();
            System.out.printf("%.5f",x2);
    
    }

}
