#include <bits/stdc++.h>
using namespace std;
int main() {
  double a, b, c, d;
  cin >> a >> b >> c;
  d = (b * b) - 4 * a * c;
  if (d < 0)
    cout << "-1" << endl;
  else if (d == 0) {
    cout << "1" << endl;
    cout << fixed << setprecision(10);
    cout << (-b) / 2 * a << endl;
  } else if (d > 0) {
    cout << "2" << endl;
    cout << fixed << setprecision(10);
    cout << ((-b) - sqrt(d)) / 2 * a << endl;
    cout << ((-b) + sqrt(d)) / 2 * a << endl;
  }
  return 0;
}
