#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <complex>
using namespace std;

typedef long long ll;
typedef uint64_t ull;
typedef pair<int, int> P;
constexpr double PI = 3.1415926535897932;   // acos(-1)
constexpr double EPS = 1e-9;
constexpr int INF = 1001001001;
constexpr int mod = 1000000007;
// constexpr int mod = 998244353;

#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    using ld = long double;
    ll a, b, c;
    cin >> a >> b >> c;
    if(a == 0 && b == 0){
        if(c == 0)  cout << -1 << endl;
        else    cout << 0 << endl;
        return 0;
    }
    if(a == 0){
        ld ans = -c;
        ans /= b;
        cout << 1 << endl;
        cout << fixed << setprecision(17);
        cout << ans << endl;
        return 0;
    }

    ll D = b * b - 4 * a * c;

    constexpr ld eps = 1e-14;
    if(D > 0){
        cout << 2 << endl;
        ld ans1 = -b, ans2 = -b;
        ans1 -= sqrt(ld(D)), ans2 += sqrt(ld(D));
        ans1 /= 2, ans2 /= 2;
        ans1 /= a, ans2 /= a;
        cout << fixed << setprecision(17);
        cout << ans1 << endl;
        cout << ans2 << endl;
    }
    else if(D == 0){
        cout << 1 << endl;
        ld ans = -b;
        ans /= 2;
        ans /= a;
        cout << fixed << setprecision(17);
        cout << ans << endl;
    }
    else    cout << 0 << endl;
}