import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		long a = Integer.parseInt(sa[0]);
		long b = Integer.parseInt(sa[1]);
		long c = Integer.parseInt(sa[2]);
		br.close();

		if (a == 0) {
			if (b == 0) {
				if (c == 0) {
					System.out.println(-1);
				} else {
					System.out.println(0);
				}
			} else {
				System.out.println(1);
				System.out.println((double) -c / b);
			}
		} else if (b * b == 4 * a * c) {
			System.out.println(1);
			System.out.println((double) -b / 2 / a);
		} else if (b * b > 4 * a * c) {
			double d2 = Math.sqrt(b * b - 4 * a * c);
			System.out.println(2);
			double ans1 = (-b - d2) / 2 / a;
			double ans2 = (-b + d2) / 2 / a;
			System.out.println(Math.min(ans1, ans2));
			System.out.println(Math.max(ans1, ans2));
		} else {
			System.out.println(0);
		}
	}
}