#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;
using ll = long long;


int main() {
  ll a, b, c;
  cin >> a >>  b >>  c;

  if (a < 0) {
    a *= -1; b *= -1; c *= -1;
  }
  if (a == b && b == c && c == 0) {
    cout << -1 << endl;
    return 0;
  }

  cout << fixed << setprecision(20);
  if (a == 0) {
    if (b == 0) {
      cout << 0 << endl;
      return 0;
    }
    cout << 1 << endl;
    cout << (double)-c / b << endl;
    return 0;
  }

  ll D = b * b - 4 * a * c;
  if (D < 0) {
    cout << 0 << endl;
    return 0;
  }
  if (D == 0) {
    cout << 1 << endl;
    cout << (double)(-b) / (2 * a) << endl;
    return 0;
  }
  if (b > 0) {
    cout << 2 << endl;
    long double x1 = (-b - sqrt(D)) / (2 * a);
    cout << x1 << endl;
    cout << (double)c / a / x1 << endl;
  } else {
    cout << 2 << endl;
    long double x1 = (-b + sqrt(D)) / (2 * a);
    cout << (double)c / a / x1 << endl;
    cout << x1 << endl;
  }

  return 0;
}