#include <bits/stdc++.h>
using namespace std;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
using Int = long long;
const char newl = '\n';


template<typename T> void drop(const T &x){cout<<x<<endl;exit(0);}

struct Precision{
  Precision(){
    cout<<fixed<<setprecision(20);
  }
}precision_beet;

//INSERT ABOVE HERE
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  Int a,b,c;
  cin>>a>>b>>c;

  using D = long double;

  if(a==0){
    if(b==0 and c==0) drop(-1);
    if(b==0 and c!=0) drop(0);
    cout<<1<<newl;
    cout<<D(-c)/D(b)<<newl;
    return 0;
  }

  if(b*b-4*a*c<0) drop(0);
  if(b*b-4*a*c==0){
    cout<<1<<newl;
    cout<<D(-b)/D(2*a)<<newl;
    return 0;
  }
  cout<<2<<newl;
  cout<<(D(-b)-sqrt(D(b*b-4*a*c)))/D(2*a)<<newl;
  cout<<(D(-b)+sqrt(D(b*b-4*a*c)))/D(2*a)<<newl;
  return 0;
}