#include <bits/stdc++.h>

using namespace std;

using int64 = long long;
const int mod = 1e9 + 7;
// const int mod = 998244353;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(15);
    cerr << fixed << setprecision(15);
  }
} iosetup;


template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 > &p) {
  os << p.first << " " << p.second;
  return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
  is >> p.first >> p.second;
  return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
  for(int i = 0; i < (int) v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
  for(T &in : v) is >> in;
  return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = int64 >
vector< T > make_v(size_t a) {
  return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
  return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
  t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
  for(auto &e : t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
  FixPoint(F &&f) : F(forward< F >(f)) {}

  template< typename... Args >
  decltype(auto) operator()(Args &&... args) const {
    return F::operator()(*this, forward< Args >(args)...);
  }
};

template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint< F >{forward< F >(f)};
}

using ld = long double;
const ld eps = 1e-20;

std::vector< ld > quadratic_equation(ld a, ld b, ld c) {
  ld d = b * b - 4 * a * c;
  if(std::abs(a) < eps) return std::abs(b) > eps ? std::vector< ld >{-c / b} : std::vector< ld >{};
  if(d < -eps) return {};
  if(d < eps) return {-b / (2 * a), -b / (2 * a)};
  int sign = (b >= 0) ? 1 : -1;
  ld x0 = (-b - sign * sqrt(std::abs(d))) / (2 * a), x1 = c / (a * x0);
  if(x0 > x1) std::swap(x0, x1);
  return {x0, x1};
}


int main() {
  ld a, b, c;
  cin >> a >> b >> c;
  if(a == 0) {
    if(b != 0) {
      cout << 1 << endl;
      cout << -c / b << endl;
    } else if(c == 0) {
      cout << -1 << endl;
    } else {
      cout << 0 << endl;
    }
  } else {
    auto ret = quadratic_equation(a, b, c);
    if(ret.size() >= 2 && abs(ret[0] - ret[1]) < eps) ret.pop_back();
    cout << ret.size() << endl;
    sort(begin(ret), end(ret));
    for(auto &p : ret) cout << p << endl;
  }
}