#include <bits/stdc++.h>

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

template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }

void solve2(ll b, ll c){
  if(b==0){
    if(c==0){
      //cout << 3 << endl;
      cout << -1 << endl;
    }else{
      cout << 0 << endl;
    }
  } else {
    cout << 1 << '\n'<<setprecision(24) << -(long double)c/(long double)b << endl;
  }
}

long double calc(ll la, ll lb, ll lc, ll sign){
  long double a = (long double)la;
  long double b = (long double)lb;
  long double c = (long double)lc;
  return (-b+sign*sqrt(b*b-4*a*c))/(2*a);
  //return -(b/a)*(0.5)+sign*sqrt((b/a)*(b/a)*0.25-c/a);
}

void solve(ll a, ll b, ll c){
  if(a==0){
    solve2(b,c);
    return;
  }
  if(b==0){
    if(c==0){
      cout << 1 << '\n' << 0 << endl;
    } else if(a/abs(a) == c/abs(c)){
      cout << 0 << endl;
    } else{
      cout << 2 << '\n' << setprecision(24) <<
      -sqrt(-(long double)c/(long double)a) << '\n' <<
      sqrt(-(long double)c/(long double)a) << endl;
    }
    return;
  }

  if(4*((double)a/(double)b)*((double)c/(double)b)>1){
    cout << 0 << endl;
  } else if(abs(4*((double)a/(double)b)*((double)c/(double)b)-1)<1e-12){
    cout << 1 << '\n' <<setprecision(24) << -(double)b/(2*(double)a) << endl;
  } else {
    cout << 2 << '\n' <<setprecision(24) <<
    min(calc(a,b,c,-1),calc(a,b,c,1)) << '\n' <<
    max(calc(a,b,c,-1),calc(a,b,c,1)) << endl;
  }
}


int main() {
  //int T;
  //cin >>T;
  //ll a[T],b[T],c[T];
  //rep(i,T){
  //  cin >> a[i] >> b[i] >> c[i];
  //}
  ll a,b,c;
  cin >> a >> b >> c;

  //rep(i,T){
    //solve(a[i],b[i],c[i]);
  //}
  solve(a,b,c);

}