#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  double a, b, c;
  cin >> a >> b >> c;

  if (a == 0) {
    if (b != 0) {
      cout << 1 << endl;
      cout << fixed << setprecision(12) << -c/b << endl;
    } else {
      if (c == 0)
        cout << -1 << endl;
      else
        cout << 0 << endl;
    }
  } else {
    double d = b*b - 4*a*c;
    if (d < 0) {
      cout << 0 << endl;
    } else if (d == 0) {
      cout << 1 << endl;
      cout << fixed << setprecision(12) << -b/(2*a) << endl;
    } else {
      cout << 2 << endl;
      double x1 = (-b + sqrt(d)) / (2 * a);
      double x2 = (-b - sqrt(d)) / (2 * a);
      cout << fixed << setprecision(12) << min(x1,x2) << endl;
      cout << fixed << setprecision(12) << max(x1,x2) << endl;      
    }
  }
  
  return 0;
}