import java.util.Scanner;

public class P20B {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		double d = b * b - 4 * a * c;
		if (a == 0) {
			System.out.println(-1);
		} else if (d < 0) {
			System.out.println(0);
		} else if (d == 0) {
			System.out.println(1);
			System.out.println((double) -b / (2 * a));
		} else if (a != 0 && d > 0) {
			System.out.println(2);
			System.out.println((double) ((-b + (double) Math.pow(d, 1 / 2))
					/ (2 * a)));
			System.out.println((double) ((-b - (double) Math.pow(d, 1 / 2))
					/ (2 * a)));
		}
	}
}