#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  cout<<fixed<<setprecision(11);
  double a,b,c;cin>>a>>b>>c;
  if(a==0&&b==0&&c==0){
    cout<<-1<<endl;
  }else if(a==0&&b==0&&c!=0){
    cout<<-1<<endl;
  }else if(a==0&&b!=0){
    cout<<1<<endl;
    cout<<-c/b<<endl;
  }else{
    double d=b*b-4*a*c;
    if(d<0){
      cout<<-1<<endl;
    }else if(d>0){
      double x=(b>0?-b-sqrt(d)/2*a:-b+sqrt(d)/2*a);
      cout<<2<<endl;
      cout<<x<<endl;
      cout<<c/a*x<<endl;
    }else{
      cout<<1<<endl;
      cout<<-b/2*a<<endl;
    }
  }
}