#include <cmath>
#include <iomanip>
#include <iostream>
using namespace std;

int main() {
  long long a, b, c;
  cin >> a >> b >> c;
  if (a == 0 && b == 0) {
    if (c == 0)
      cout << -1 << endl;
    else
      cout << 0 << endl;
  } else if (a == 0) {
    cout << 1 << ' ' << fixed << setprecision(15) << -c * 1.0 / b << endl;
  } else {
    long long D = b * b - 4 * a * c;
    if (D > 0)
      cout << 2 << ' ' << fixed << setprecision(15)
           << (-b - sqrt(D)) / (2.0 * a) << ' ' << (-b + sqrt(D)) / (2.0 * a)
           << endl;
    else if (D == 0)
      cout << 1 << ' ' << fixed << setprecision(15) << -b / (2.0 * a) << endl;
    else
      cout << 0 << endl;
  }
}