#include <bits/stdc++.h>
#include <random>
using namespace std;
//#include <atcoder/all>
//using namespace atcoder;
using ll = long long;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vvvvll = vector<vvvll>;
using vvvvvll = vector<vvvvll>;
using vvvvvvll = vector<vvvvvll>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vvvb = vector<vvb>;
using vvvvb = vector<vvvb>;
using vd = vector<double>;
using vvd = vector<vd>;
using vvvd = vector<vvd>;
using vvvvd = vector<vvvd>;
using vvvvvd = vector<vvvvd>;
#define all(A) A.begin(),A.end()
#define ALL(A) A.begin(),A.end()
#define rep(i, n) for (ll i = 0; i < (ll) (n); i++)
using pqr = priority_queue<pair<ll, ll>, vector<pair<ll, ll>>, greater<pair<ll, ll>>>;

template<class T>
bool chmax(T& p, T q, bool C = 1) {
    if (C == 0 && p == q) {
        return 1;
    }
    if (p < q) {
        p = q;
        return 1;
    }
    else {
        return 0;
    }
}

template<class T>
bool chmin(T& p, T q, bool C = 1) {
    if (C == 0 && p == q) {
        return 1;
    }
    if (p > q) {
        p = q;
        return 1;
    }
    else {
        return 0;
    }
}

ll gcd(ll(a), ll(b)) {
    if (b == 0)return a;
    ll c = a;
    while (a % b != 0) {
        c = a % b;
        a = b;
        b = c;
    }
    return b;
}

ll mod = 998244353;
ll modPow(long long a, long long n, long long p = mod) {
    if (n == 0) return 1; // 0乗にも対応する場合
    if (n == 1) return a % p;
    if (n % 2 == 1) return (a * modPow(a, n - 1, p)) % p;
    long long t = modPow(a, n / 2, p);
    return (t * t) % p;
}






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

    ll A,B,C;
    cin>>A>>B>>C;
    if(A==0){
        if(B==0&&C==0){
            cout<<-1<<endl;
        }
        else if(B==0){
            cout<<0<<endl;
        }
        else{
            cout<<1<<endl;
            cout<<fixed<<setprecision(16);
            cout<<double(-C)/double(B)<<endl;
        }
        return 0;
    }
    ll D=B*B-4*A*C;
    if(D<0){
        cout<<0<<endl;
        return 0;
    }
    if(D==0){
        cout<<1<<endl;
        cout<<fixed<<setprecision(16);
        cout<<double(-B)/double(2*A)<<endl;
    }
    else{
        double d=(double(double(B*B)/double(A*A))-double(4*C)/double(A));
        d=sqrt(d);
        cout<<2<<endl;
        cout<<fixed<<setprecision(16);
        double a=(double(-B)/double(A)-d)/double(2);
        double b=(double(-B)/double(A)+d)/double(2);
        if(B>0&&abs(b)<1e-10){
            b=double(C)/double(A)/a;
        }
        else if(B<0&&abs(a)<1e-10){
            a=double(C)/double(A)/b;
        }
        cout<<a<<endl<<b<<endl;
    }
}