#include using namespace std; using ll = long long; int main() { ll a, b, c; cin >> a >> b >> c; if (a == 0) { if (b == 0) { if (c == 0) printf("-1\n"); else printf("0\n"); } else printf("1\n%.15f\n", (double)-c / b); } else { ll d = b * b - 4 * a * c; if (d < 0) printf("0\n"); else if (d == 0) printf("1\n%.15f\n", (double)-b / (2 * a)); else { long double s1 = (-b + sqrt((long double)d)) / (2 * a); long double s2 = (-b - sqrt((long double)d)) / (2 * a); cout << 2 << endl; cout << fixed << setprecision(15) << min(s1, s2) << endl; cout << max(s1, s2) << endl; } } }