#include <bits/stdc++.h>
using namespace std;
string s;
int main() {
  double a, b, c;
  cin >> a >> b >> c;
  double d = b * b - 4 * a * c;
  if (a == b && b == c && c == 0) {
    cout << -1;
    return 0;
  }
  if (a == b && b == 0) {
    cout << 0;
    return 0;
  }
  cout << fixed << setprecision(20);
  if (a == 0) {
    cout << "1\n" << -c / b;
    return 0;
  }
  if (d < 0) {
    cout << "0";
    return 0;
  }
  if (d == 0) {
    cout << "1\n" << -b / (2 * a);
    return 0;
  }
  cout << "2\n";
  cout << min(((-b - sqrt(d)) / (2 * a)), ((-b + sqrt(d)) / (2 * a))) << "\n";
  cout << max(((-b - sqrt(d)) / (2 * a)), ((-b + sqrt(d)) / (2 * a))) << "\n";
  ;
  return 0;
}
