#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> P;
typedef pair<int,int> Pi;
#define rep(i,n) for(ll i=0;i<n;i++)
#define FOR(i,a,b) for(ll i=a;i<b;i++)
#define rrep(i,n) for(ll i=n-1;i>=0;i--)
#define rFOR(i,a,b) for(ll i=a-1;i>=b;i--)
#define fi first
#define se second
#define endl "\n"

template<typename T> inline bool chmax(T &a, T b){if(a<b){a=b;return true;}return false;}
template<typename T> inline bool chmin(T &a, T b){if(a>b){a=b;return true;}return false;}
template<typename T> ostream& operator<<(ostream& s,const complex<T>& d) {return s<<"("<<d.real()<<", "<<d.imag()<< ")";}
template<typename T1, typename T2> ostream& operator<<(ostream& s,const pair<T1,T2>& d) {return s<<"("<<d.first<<", "<<d.second<<")";}
template<typename T> ostream& operator<<(ostream& s, const vector<T>& d){int len=d.size();rep(i,len){s<<d[i];if(i<len-1) s<<" ";}return s;}
template<typename T> ostream& operator<<(ostream& s,const vector<vector<T>>& d){int len=d.size();rep(i,len){s<<d[i]<<endl;}return s;}
template<typename T> ostream& operator<<(ostream& s,const set<T>& v){s<<"{ ";for(auto itr=v.begin();itr!=v.end();++itr) {if (itr!=v.begin()) {s<< ", ";}s<<(*itr);}s<<" }";return s;}
template<typename T> ostream& operator<<(ostream& s,const multiset<T>& v){s<<"{ ";for(auto itr=v.begin();itr!=v.end();++itr) {if (itr!=v.begin()) {s<< ", ";}s<<(*itr);}s<<" }";return s;}
template<typename T1, typename T2> ostream& operator<<(ostream& s,const map<T1,T2>& m){s<<"{"<<endl;for(auto itr=m.begin();itr!=m.end();++itr){s<<" "<<(*itr).first<<" : "<<(*itr).second<<endl;}s<<"}"<<endl;return s;}
template<class T> vector<T> make_vec(size_t n, T a) { return vector<T>(n, a); }
template<class... Ts> auto make_vec(size_t n, Ts... ts) { return vector<decltype(make_vec(ts...))>(n, make_vec(ts...)); }

const ll mod=1'000'000'007;
const ll inf=1'000'000'000'000'000'00;
const int INF=1'000'000'000;
const double EPS=1e-10;
const double PI=acos(-1);

void solve(){
    ll a,b,c;
    cin>>a>>b>>c;
    if(a==0){
        if(b==0){
            if(c==0){
                cout<<-1<<endl;
            }else{
                cout<<0<<endl;
            }
        }else{
            cout<<1<<endl;
            cout<<setprecision(20)<<double(-c)/double(b)<<endl;
        }
    }else{
        ll d=b*b-4*a*c;
        if(d<0) cout<<0<<endl;
        else if(d==0){
            cout<<1<<endl;
            cout<<setprecision(20)<<double(-b)/double(2*a)<<endl;
        }else{
            double tmp=sqrt(d);
            double ans1,ans2;
            if(b>=0){
                ans1=(-b-tmp)/double(2*a);
                ans2=c/(a*ans1);
            }else{
                ans1=(-b+tmp)/double(2*a);
                ans2=c/(a*ans1);
            }
            if(ans1>ans2) swap(ans1,ans2);
            cout<<2<<endl;
            cout<<setprecision(20)<<ans1<<endl;
            cout<<setprecision(20)<<ans2<<endl;
        }
    }
}

int main(){
    cin.tie(0);ios::sync_with_stdio(false);
    int t=1;
    while(t--) solve();
}