#include <bits/stdc++.h>

using namespace std;

int main() {
    int a,b,c;
    double d;
    cin >> a >> b >> c;
    d = b*b - 4 * a * c;
    if(a==0 && b==0 && c==0){
        return cout << -1,0;
    }
    if(a==0)
        return cout << 1 << '\n' << fixed << setprecision(6) << -double(c)/double(b),0;
    if(d<0){
        cout << 0;
    } else {
        if(d==0){
            cout << 1 << fixed << setprecision(6) << -double(b)/(2.0*double(a));
        } else {
            d = sqrt(d);
            cout << 2 << '\n' << fixed << setprecision(6) << (-double(b)+d)/(2.0*double(a))
                                                << '\n' << (-double(b)-d)/(2.0*double(a));
        }
    }

}