#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define rep1(i,n) for(int i=1;i<=(int)n;i++)
#define sp(n) cout << fixed << setprecision(n)
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
typedef long long ll;
using namespace std;
int main(void){
    sp(15);
    long double a,b,c;cin>>a>>b>>c;
    if(a==0&&b==0){
        if(c==0)cout<<-1<<endl;
        else cout<<0<<endl;
        return 0;
    }else if(a==0){
        cout<<1<<endl;
        long double r1=-c/b;
        cout<<r1<<endl;
        return 0;
    }else if(b*b-4*a*c<0){
        cout<<0<<endl;
        return 0;
    }
    long double buf1=-b,buf2=sqrt(b*b-4*a*c);
    if(buf2==0){
        cout<<1<<endl;
        long double buf3=(buf1+buf2)/((long double)2*a);
        cout<<buf3<<endl;
        return 0;
    }
    else cout<<2<<endl;
    long double buf3=(buf1+buf2)/((long double)2*a),buf4=(buf1-buf2)/((long double)2*a);
    cout<<buf4<<endl;
    cout<<buf3<<endl;
}