#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
constexpr int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  // int t; cin >> t;
  int t = 1;
  while (t--) {
    int a, b, c; cin >> a >> b >> c;
    if (a == 0) {
      if (b == 0) {
        cout << (c == 0 ? -1 : 0) << '\n';
      } else {
        cout << 1 << '\n' << -1.0L * c / b << '\n';
      }
    } else {
      ll d = 1LL * b * b - 4LL * a * c;
      if (d > 0) {
        long double sqrt_d = sqrtl(d);
        long double x1 = -0.5 * (b >= 0 ? b + sqrt_d : b - sqrt_d) / a, x2 = c / (x1 * a);
        if (x1 > x2) swap(x1, x2);
        cout << 2 << '\n' << x1 << ' ' << x2 << '\n';
      } else if (d == 0) {
        cout << 1 << '\n' << -0.5L * b / a << '\n';
      } else {
        cout << 0 << '\n';
      }
    }
  }
  return 0;
}