#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int d = b * b - 4 * a * c;
  if (a == 0)
    cout << "-1" << endl;
  else if (d < 0)
    cout << "0" << endl;
  else if (d == 0) {
    printf("1\n");
    double r = (-(double)b) / (2 * ((double)a));
    printf("%.7f\n", r);
  } else if (d > 0) {
    double k = sqrt(d);
    double m = -b + k;
    double n = -b - k;
    m = m / (2 * a);
    n = n / (2 * a);
    cout << 2 << endl;
    if (m >= n) {
      printf("%7f\n", n);
      printf("%7f\n", m);
    } else {
      printf("%7f\n", n);
      printf("%7f\n", m);
    }
  }
  return 0;
}
