#include <bits/stdc++.h>
#define rep(i, n) for (ll i = 0; i < (n); i++)
#define all(x) (x).begin(), (x).end()
using ll = long long;
using namespace std;
template <typename T> using vec = std::vector<T>;

int main() {
    ll a, b, c;
    cin >> a >> b >> c;
    if(!a&&!b&&!c){
        cout << -1 << endl;
        return 0;
    } else if(!a&&!b){
        cout << 0 << endl;
        return 0;
    } else if(!a){
        cout << 1 << endl;
        long double ans = c/b;
        cout << fixed << setprecision(15);
        cout << ans << endl;
        return 0;
    }

    ll D = b * b - 4 * a * c;
    if (D > 0) {
        cout << 2 << endl;
        if(-b>=0){
            long double bigans = (-b+sqrtl(b*b-4*a*c))/(2*a);
            long double smlans = (c/a)/bigans;
            cout << fixed << setprecision(15);
            cout << smlans << endl;
            cout << bigans << endl;
        } else {
            long double smlans = (-b-sqrtl(b*b-4*a*c))/(2*a);
            long double bigans = (c/a)/smlans;
            cout << fixed << setprecision(15);
            cout << smlans << endl;
            cout << bigans << endl;
        }
    } else if (D == 0) {
        cout << 1 << endl;
        long double ans = -b/(2*a);
        cout << fixed << setprecision(15);
        cout << ans << endl;
    } else {
        cout << 0 << endl;
    }
}