import java.util.Scanner;
public class equation {
	public static void main(String[] args) {
		long u,w,x;double k,a,b;
		Scanner sc = new Scanner(System.in);
		u = sc.nextLong();
		w = sc.nextLong();
		x = sc.nextLong();
		k=(double)(w*w)-4.000000*u*x;
		if(k>0.0)
		{
			a=(-w+Math.sqrt(k))/(2.000000*u);
			b=(-w-Math.sqrt(k))/(2.000000*u);
			if(a<b)System.out.print("2\n"+a+"0000000\n"+b+"000000");
			else System.out.print("2\n"+b+"000000\n"+a+"000000");
		}
		else
			System.out.print("-1");
	}

}
