#include <bits/stdc++.h>

using namespace std;

int main() {
    double a,b,c,d;
    cin >> a >> b >> c;
    d = b*b - 4 * a * c;
    if(int(a)==0 && int(b)==0 && int(c)==0){
        return cout << -1,0;
    }
    if(int(a)==0)
        return cout << 1 << '\n' << fixed << setprecision(6) << -c/b,0;
    if(d<0){
        cout << 0;
    } else {
        if(int(d)==0){
            cout << 1 << fixed << setprecision(6) << -b/(2*a);
        } else {
            d = sqrt(d);
            cout << 2 << '\n' << fixed << setprecision(6) << (-b+d)/(2*a) << '\n' << (-b-d)/(2*a);
        }
    }

}