#include <cmath>
#include <iostream>
using namespace std;
int main() {
	long long a, b, c;
	cin >> a >> b >> c;
	cout.precision(15);
	if (a == 0 && b == 0 && c == 0) {
		cout << -1 << endl;
	}
	else if (a == 0 && b == 0) {
		cout << 0 << endl;
	}
	else if (a == 0) {
		cout << 1 << endl;
		cout << fixed << -(long double)(c) / b << endl;
	}
	else {
		long long d = b * b - 4 * a * c;
		if (d < 0) {
			cout << 0 << endl;
		}
		else if (d == 0) {
			cout << 1 << endl;
			cout << -(long double)(b) / (2 * a) << endl;
		}
		else {
			cout << 2 << endl;
			cout << (-b - sqrt((long double)(d))) / (2 * a) << endl;
			cout << (-b + sqrt((long double)(d))) / (2 * a) << endl;
		}
	}
	return 0;
}