#include <bits/stdc++.h>
using namespace std;
float a, b, c;
float delta;
int main() {
  cin >> a >> b >> c;
  b /= a;
  a = 1;
  c /= a;
  if (a == 0) {
    if (b != 0 && c != 0) {
      cout << 1 << endl << (-1 * c) / b;
      return 0;
    }
    if (b != 0 && c == 0) {
      cout << 1 << endl << 0;
    }
    cout << -1;
    return 0;
  }
  delta = (b * b) - (4 * a * c);
  if (delta < 0) {
    cout << 0;
    return 0;
  }
  if (delta == 0) {
    cout << 1 << endl;
    cout << fixed << setprecision(5) << (-1 * b) / (2 * a);
    return 0;
  } else {
    cout << 2 << endl;
    cout << fixed << setprecision(5) << ((-1 * b) - sqrt(delta)) / (2 * a);
    cout << endl;
    cout << fixed << setprecision(5) << ((-1 * b) + sqrt(delta)) / (2 * a);
  }
  return 0;
}
