#include <cmath>
#include <iomanip>
#include <iostream>
using namespace std;
int main() {
    long long a, b, c; cin >> a >> b >> c;
    cout << setprecision(16);
    if (a == 0) {
        if (b == 0) {
            if (c == 0) cout << "-1\n";
            else cout << "0\n";
        } else {
            cout << "1\n" << -(double)c/b << endl;
        }
    } else {
        long long d = b * b - 4 * a * c;
        if (d == 0) {
            cout << "1\n" << -b/2.0/a << endl;
        } else if (d < 0) {
            cout << "0\n";
        } else {
            double r = sqrt(d);
            cout << "2\n" << (-b-r)/2.0/a << endl << (-b+r)/2.0/a << endl;
        }
    }
}