#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<long long,long long> pll;
#define ep emplace_back
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
constexpr int mod=1000000007;
constexpr int mod1=998244353;
vector<int> dx={0,1,0,-1},dy={-1,0,1,0};
bool inside(int y,int x,int h,int w){ if(y<h && y>=0 && x<w && x>=0) return true; return false; }
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; }





int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	ll a,b,c;cin >> a >> b >> c;
	if(a == 0){
		cout << -1 << endl;
		return 0;
	}
	if(b * b - 4 * a * c < 0){
		cout << 0 << endl;
		return 0;
	}
	if(b * b - 4 * a * c == 0){
		cout << 1 << endl;
		cout << setprecision(20) << fixed << -b / (2 * a) << endl;
		return 0;
	}
	double ans1 = (double)(-b + sqrt(b * b - 4 * a * c)) / (double)(2 * a), ans2 = (double)(-b - sqrt(b * b - 4 * a * c)) / (double)(2 * a);
	cout << 2 << endl;
	cout << setprecision(20) << fixed << ans2 << endl << ans1 << endl;
}