// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
using namespace std;

using fltype = long double;
using itype = long long;


vector<fltype> quadratic_equation(itype a, itype b, itype c) {
    assert(abs(a) <= (1 << 30) && abs(b) <= (1 << 30) && abs(c) <= (1 << 30));
    if (a) {
        if (a < 0) {
            a = -a;
            b = -b;
            c = -c;
        }
        itype d = b * b - 4 * a * c;
        if (d > 0) {
            if (b > 0) {
                fltype x1 = (-b - sqrt((fltype)d)) / (2 * a);
                fltype x2 = c / (fltype)a / x1;
                assert(x1 <= x2);
                return { x1, x2 };
            }
            else {
                fltype x2 = (-b + sqrt((fltype)d)) / (2 * a);
                fltype x1 = c / (fltype)a / x2;
                assert(x1 <= x2);
                return { x1, x2 };
            }
        }
        else if (d == 0) {
            return { -b / (fltype)(2 * a) };
        }
        else {
            return {};
        }
    }
    else if (b) {
        return { -c / (fltype)b };
    }
    else if (c) {
        return {};
    }
    else {
        // represents infinite
        return {-1, -1, -1};
    }
}


int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    itype a, b, c;
    cin >> a >> b >> c;
    vector<fltype> res = quadratic_equation(a, b, c);
    cout << setprecision(16);
    if (res.size() == 3) {
        cout << -1 << '\n';
    }
    else {
        cout << res.size() << '\n';
        for (auto& i : res) {
            cout << i << '\n';
        }
    }
    return 0;
}