#include <bits/stdc++.h>
//#include<boost/multiprecision/cpp_int.hpp>
#include<boost/multiprecision/cpp_dec_float.hpp>
//#include <atcoder/all>
#define rep(i, a) for (int i = (int)0; i < (int)a; ++i)
#define rrep(i, a) for (int i = (int)a - 1; i >= 0; --i)
#define REP(i, a, b) for (int i = (int)a; i < (int)b; ++i)
#define RREP(i, a, b) for (int i = (int)a - 1; i >= b; --i)
#define repl(i, a) for (ll i = (ll)0; i < (ll)a; ++i)
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define popcount __builtin_popcount
#define fi first
#define se second
using ll = long long;
constexpr ll mod = 1e9 + 7;
constexpr ll mod_998244353 = 998244353;
constexpr ll INF = 1LL << 60;

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

//using lll=boost::multiprecision::cpp_int;
using Double=boost::multiprecision::number<boost::multiprecision::cpp_dec_float<128>>;//仮数部が1024桁
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;
}

template <typename T>
T mypow(T x, T n, const T &p = -1)
{ //x^nをmodで割った余り

	if (p != -1)
	{
		x %= p;
	}
	T ret = 1;
	while (n > 0)
	{
		if (n & 1)
		{
			if (p != -1)
				ret = (ret * x) % p;
			else
				ret *= x;
		}
		if (p != -1)
			x = (x * x) % p;
		else
			x *= x;
		n >>= 1;
	}
	return ret;
}

using namespace std;
//using namespace atcoder;


void solve()
{	
  ll a,b,c;
  cin>>a>>b>>c;
  auto D=[](ll a,ll b,ll c)->ll{
    return b*b-a*c*4;
  };
  if(!a){
    if(!b){
      if(!c){
        cout<<-1<<"\n";
      }else{
        cout<<0<<"\n";
      }
    }else{
      cout<<1<<"\n";
      Double bb=b,cc=c;
      Double x=-cc/bb;
      cout<<x<<"\n";
    }
  }
  else if(D(a,b,c)<0){
    cout<<0<<"\n";
  }else if(D(a,b,c)==0){
    cout<<1<<"\n";
    Double aa=a,bb=b;
    Double x=-bb/(aa*2);
    cout<<x<<"\n";
  }else{
    cout<<2<<"\n";
    Double l=0,r=3000000000;
    Double aa=a,bb=b,cc=c;
    rep(i,500){
      Double mid=(l+r)/2;
      if(mid*mid<=bb*bb-aa*cc*4)l=mid;
      else r=mid;
    }
    Double x=l;
    Double x1=0;
    if(b>=0)x1=(-bb-x)/(aa*2);
    else x1=(-bb+x)/(aa*2);
    Double x2=-bb/aa-x1;
    if(x1>x2)swap(x1,x2);
    cout<<x1<<"\n"<<x2<<"\n";
  }
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout << fixed << setprecision(50);
	solve();
	return 0;
}