#include <bits/stdc++.h>
using namespace std;

int main() {
    int64_t a, b, c, det;
    cin >> a >> b >> c;
    assert(-1000000000 <= a && a <= 1000000000);
    assert(-1000000000 <= b && b <= 1000000000);
    assert(-1000000000 <= c && c <= 1000000000);
    det = b * b - 4 * a * c;
    cout << setprecision(17);
    if (a == 0) {
        if (b == 0) {
            if (c == 0) {
                cout << -1 << endl;
            } else {
                cout << 0 << endl;
            }
        } else {
            cout << 1 << endl;
            cout << (double) -c / b << endl;
        }
    } else {
        if (det < 0) {
            cout << 0 << endl;
        } else if (det == 0) {
            cout << 1 << endl;
            cout << (double) -b / (2 * a) << endl;
        } else {
            double s = sqrt((double) det);
            cout << 2 << endl;
            if (b > 0) {
                cout << (-b - s) / (2 * a) << endl;
                cout << (2 * c) / (-b - s) << endl;
            } else {
                cout << (2 * c) / (-b + s) << endl;
                cout << (-b + s) / (2 * a) << endl;
            }
        }
    }
}