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

using namespace std;

int main()
{
    double a, b, c, d, x1, x2;
    cin >> a >> b >> c;
    d = b*b - 4*a*c;
    if (a == 0)
        if (b == 0)
            if (c == 0) cout << -1;
            else cout << 0;
        else
        {
            cout << 1 << endl;
            cout << setprecision(6) << c*(-1)/b;
        }
    else
        if (d < 0)
        {
            cout << 0;
        }
        else
            if (d == 0)
            {
                cout << 1 << endl;
                x1 = (b*(-1) + sqrt(d))/(2*a);
                cout << setprecision(6) << x1;
            }
            else
            {
                cout << 2 << endl;
                x1 = (b*(-1) - sqrt(d))/(2*a);
                x2 = (b*(-1) + sqrt(d))/(2*a);
                cout << setprecision(6) << x1 << endl;
                cout << setprecision(6) << x2;
            }
}