#include <bits/stdc++.h>
using namespace std;
const int N = 1e5;
const long long INT = 1e9;
const long long LONG = 1e18;
const long long mod = 1e9 + 7;
int main() {
  float a, b, c;
  cin >> a >> b >> c;
  float d = b * b - 4 * a * c;
  if (a == 0 && b == 0 && c == 0) {
    cout << -1;
    return 0;
  }
  if (d < 0) cout << 0;
  if (d == 0) {
    cout << 1 << '\n';
    cout << setprecision(8) << fixed << -b / 2;
  }
  if (d > 0) {
    cout << 2 << '\n';
    cout << setprecision(8) << fixed << (-b - sqrt(d)) / 2 << '\n';
    cout << setprecision(8) << fixed << (-b + sqrt(d)) / 2 << '\n';
  }
}
