//confirm 0LL and 1LL
//confirm cornercases such as 0
//confirm times of cin < 1^6
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
using Vec = vector<ll>;
using VecP = vector<P>;
using VecB = vector<bool>;
using VecC = vector<char>;
using VecVec = vector<Vec>;
#define REP(i, m, n) for(ll (i) = (m); (i) < (n); ++(i))
#define REPN(i, m, n) for(ll (i) = (m); (i) <= (n); ++(i))
#define REPR(i, m, n) for(ll (i) = (m)-1; (i) >= (n); --(i))
#define REPNR(i, m, n) for(ll (i) = (m); (i) >= (n); --(i))
#define rep(i, n) REP(i, 0, n)
#define repn(i, n) REPN(i, 1, n)
#define repr(i, n) REPR(i, n, 0)
#define repnr(i, n) REPNR(i, n, 1)
#define all(s) (s).begin(), (s).end()
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define fs first
#define sc second
template <typename T>
bool chmax(T &a, const T& b){if(a < b){a = b; return true;} return false;}
template <typename T>
bool chmin(T &a, const T& b){if(a > b){a = b; return true;} return false;}
template <typename T>
void co(const T a){cout << a << endl;}
template <typename T>
void cosp(const T a){cout << a << ' ';}
void coVec(const Vec &v){for(ll i : v) cosp(i); cout << endl;}
void sonic(){ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);}
void setp(const ll n){cout << fixed << setprecision(n);}
const ll INF = 1e9+1;
const ll LINF = 1e18+1;
const ll MOD = 1e9+7;
//const ll MOD = 998244353;
const double PI = acos(-1);
const double EPS = 1e-9;

int main(void){
	ll a, b, c;
	cin >> a >> b >> c;
	setp(20);
	if(!a && !b){
		if(c) co(0);
		else co(-1);
		return 0;
	}

	if(!a){
		co(1);
		co((double)-c/b);
		return 0;
	}

	ll d = b*b-4*a*c;
	if(d < 0){
		co(0);
	}else if(d == 0){
		co(1);
		co((double)-b/2/a);
	}else{
		co(2);
		co((double)(-b-sqrt(d))/2/a);
		co((double)(-b+sqrt(d))/2/a);
	}

	return 0;
}