#include "bits/stdc++.h"
using namespace std;
#define int long long
#define FOR(i, a, b) for(int i=(a);i<(b);i++)
#define RFOR(i, a, b) for(int i=(b-1);i>=(a);i--)
#define REP(i, n) for(int i=0; i<(n); i++)
#define RREP(i, n) for(int i=(n-1); i>=0; i--)
#define ALL(a) (a).begin(),(a).end()
#define UNIQUE_SORT(l) sort(ALL(l)); l.erase(unique(ALL(l)), l.end());
#define CONTAIN(a, b) find(ALL(a), (b)) != (a).end()
#define array2(type, x, y) array<array<type, y>, x>
#define vector2(type) vector<vector<type> >
#define out(...) printf(__VA_ARGS__)

int dxy[] = {0, 1, 0, -1, 0};

void solve();
signed main()
{
#if DEBUG
    std::ifstream in("input.txt");
    std::cin.rdbuf(in.rdbuf());
#endif
    cin.tie(0);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}

/*================================*/

int a,b,c;

void solve() {
    cin>>a>>b>>c;
    
    if (a==0 && b==0) {
        cout << ((c==0) ? -1 : 0) << endl;
        return;
    }
    if (a==0) {
        cout << 1 << endl;
        double ans = -1 * (double)1.0 * c / b;
        out("%.16f\n", ans);
        return;
    }
    int border = b*b - 4 * a * c;
    if (border < 0) {
        cout << 0 << endl;
        return;
    }
    if (border == 0) {
        cout << 1 << endl;
        double ans = (double)0.5 * -b / a;
        out("%.16f\n", ans);
        return;
    }
    double ans0 = (-b + sqrt(border)) / 2 / a;
    double ans1 = (-b - sqrt(border)) / 2 / a;
    cout << 2 << endl;
    out("%.16f\n", ans1);
    out("%.16f\n", ans0);
}