#include <cassert>
#include <cmath>
#include <iomanip>
#include <iostream>
using namespace std;
double bs(double pos, double neg, double a, double b, double c, double eps) {
    assert(a*pos*pos+b*pos+c>0);
    assert(a*neg*neg+b*neg+c<0);
    for (int i = 0; i < 1000; i++) {
        double m = (pos + neg) / 2;
        if (a*m*m+b*m+c < 0) neg = m;
        else pos = m;
    }
    return (pos+neg)/2;
}

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 {
        if (a < 0) a = -a, b = -b, c = -c;
        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 v = -b/2.0/a,
                x = bs(v-d+1, v, a, b, c, 1e-11),
                y = bs(v+d+1, v, a, b, c, 1e-11);
            cout << "2\n" << x << endl << y << endl;
        }
    }
}