#include <bits/stdc++.h>
using namespace std;

int main() {
  long long a, b, c;
  cin >> a >> b >> c;
  long double A = a, B = b, C = c;
  cout << fixed << setprecision(18);
  if (a == 0 && b == 0 && c == 0) {
    cout << -1 << endl;
  } else if (a == 0 && b == 0) {
    cout << 0 << endl;
  } else if (a == 0) {
    cout << 1 << endl;
    cout << -(C / B) << endl;
  } else {
    long long D = b * b - 4 * a * c;
    if (D < 0) {
      cout << 0 << endl;
    } else if (D == 0) {
      cout << 1 << endl;
      cout << -B / (2 * A) << endl;
    } else {
      cout << 2 << endl;
      long double ans1 = (-B + sqrt(static_cast<long double>(D))) / (2 * A);
      long double ans2 = (-B - sqrt(static_cast<long double>(D))) / (2 * A);
      cout << min(ans1, ans2) << endl;
      cout << max(ans1, ans2) << endl;
    }
  }
}