#include <bits/stdc++.h>
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 {
            double s1 = (double)(-b + sqrt(d)) / (2 * a);
            double s2 = (double)(-b - sqrt(d)) / (2 * a);
            printf("2\n%.15f\n%.15f\n", min(s1, s2), max(s1, s2));
        }
    }
}