
import java.util.Scanner;
public class Main{

   	public static void main(String[] args){
   		Scanner in=new Scanner(System.in);
   		double x1,x2,e;
   		int a,b,c;
   		a=in.nextInt();
   		b=in.nextInt();
   		c=in.nextInt();
   		e=Math.pow(b,2)-4*a*c;
   		if(e<0)System.out.println(-1);
   		else if(e>0)
   		{
   			x1=(-b-Math.sqrt(e))/(2*a);x2=(-b+Math.sqrt(e))/(2*a);
   			System.out.println(2);
   			System.out.format("%.10f\n%.10f",x1,x2);
   		}
   		else 
   			{
   			System.out.println(1);
   			System.out.format("%.10f",-b/(2*a));
   			}
   	}
}