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

#define int long long
using ld=long double;

signed main(){
  int a,b,c;cin>>a>>b>>c;
  if(!a){
    if(!b){
      if(!c)cout<<-1<<endl;
      else cout<<0<<endl;
    }
    else{
      cout<<1<<endl;
      cout<<fixed<<setprecision(12)<<(ld)(-c)/b<<endl;
    }
    return 0;
  }
  if(b*b-4*a*c>0){
    cout<<2<<endl;
    cout<<fixed<<setprecision(12)<<(-b-sqrt(b*b-4*a*c))/(2*a)<<endl;
    cout<<fixed<<setprecision(12)<<(-b+sqrt(b*b-4*a*c))/(2*a)<<endl;
  }
  if(b*b-4*a*c==0){
    cout<<1<<endl;
    cout<<fixed<<setprecision(12)<<(ld)(-b)/(2*a)<<endl;
  }
  if(b*b-4*a*c<0){
    cout<<0<<endl;
  }
}