#include<bits/stdc++.h>
using namespace std;
int main(){
    cout<<setprecision(16);
    long long a,b,c;cin>>a>>b>>c;
    long long D=b*b-4*a*c;
    double A=a,B=b,C=c;
    if(A==0){
        if(B==0){
            if(C==0){
                cout<<-1<<endl;
                return 0;
            }
            else{
                cout<<0<<endl;
                return 0;
            }
        }
        else{
            cout<<1<<endl;
            cout<<B/C<<endl;
            return 0;
        }
    }
    else{
        if(D<0){
            cout<<0<<endl;
            return 0;
        }
        else if(D==0){
            cout<<1<<endl;
            cout<<(-B/A/2)<<endl;
            return 0;
        }
        else if(D>0){
            cout<<2<<endl;
            cout<<min(((sqrt(double(D))-B)/A/2),((-sqrt(double(D))-B)/A/2))<<endl;
            cout<<max(((sqrt(double(D))-B)/A/2),((-sqrt(double(D))-B)/A/2))<<endl;
            return 0;
        }
    }
}