// 答え分からん・・・サンプル２のやつだけ直した

#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

int main() {
    long long a, b, c; cin >> a >> b >> c;
    
    cout << setprecision(60);
     
    if (a == 0LL) {
        if (b == 0LL) {
            if (c == 0LL) {
                cout << (-1) << endl;
            } else {
                cout << 0 << endl;
            }
        } else {
            cout << 1 << endl << (-(long double)c / (long double)b) << endl;
        }
    } else {
        if (b == 0LL) {
            if (c == 0LL) {
                cout << 1 << endl << 0 << endl;
            } else {
                long double e = -(long double)c / (long double)a;
                if (e < 0.0) {
                    cout << 0 << endl;
                } else {
                    long double x = sqrt(e);
                    cout << 2 << endl << (-x) << endl << x << endl;
                }
            }
        } else {
            if (c == 0LL) {
                long double x = -(long double)b / (long double)a;
                cout << 2 << endl << min(x, (long double)0) << endl << max(x, (long double)0) << endl;
            } else {
                long long D = b * b - 4LL * a * c;
                if (D < 0LL) {
                    cout << 0 << endl;
                } else if (D == 0LL) {
                    cout << 1 << endl << (-(long double)b / (long double)(2LL*a)) << endl;
                } else if (D > 0LL) {
                    long double y = (-(long double)b - sqrt((long double)D)) / (long double)(2LL*a);
                    long double z = (-(long double)b + sqrt((long double)D)) / (long double)(2LL*a);
                    cout << 2 << endl << min(y, z) << endl << max(y, z) << endl;
                }
            }
        }
    }
    
    return 0;
}