#include <bits/stdc++.h>

using namespace std;

#define F(i, n) for(int i = 0; i < n; ++ i)
#define int int64_t

string ToStr(int a) {
    bool neg = false;
    if(a < 0) {
        neg = true;
        a = -a;
    }
    string ans;
    while(a) {
        ans += char(a % 10 + '0');
        a /= 10;
    }
    reverse(ans.begin(), ans.end());
    return (neg ? "-" : "") + ans;
}

class Complex {
public:
    Complex() {}
    Complex(int re, int im) : re_(re), im_(im) {}

    int GetRe() const {
        return re_;
    }

    int GetIm() const {
        return im_;
    }

    Complex GetConjugate() const {
        return Complex(re_, -im_);
    }

    bool IsNull() const {
        return (re_ == 0 && im_ == 0);
    }

    bool IsOne() const {
        return (re_ == 1 && im_ == 0);
    }

    string ToString() {
        if(!re_ && !im_) {
            return "0";
        }
        if(re_ && im_) {
            if(im_ == -1) {
                return ToStr(re_) + "-i";
            }
            if(im_ == 1) {
                return ToStr(re_) + "+i";
            }
            if(im_ < 0) {
                return ToStr(re_) + ToStr(im_) + 'i';
            } else {
                return ToStr(re_) + '+' + ToStr(im_) + 'i';
            }
        }
        if(!re_ && im_) {
            if(im_ == -1) {
                return "-i";
            }
            if(im_ == 1) {
                return "i";
            }
            return ToStr(im_) + 'i';
        }
        if(re_ && !im_) {
            return ToStr(re_);
        }
    }

    Complex operator+(const Complex& other) const {
        return Complex(re_ + other.GetRe(), im_ + other.GetIm());
    }

    Complex operator*(const int C) const {
        return Complex(re_ * C, im_ * C);
    }

    Complex operator*(const Complex& other) const {
        return Complex(re_ * other.GetRe() - im_ * other.GetIm(),
                       re_ * other.GetIm() + im_ * other.GetRe());
    }

    bool CavDivide(const Complex& other) const {
        Complex ans = *this * other.GetConjugate();
        int dv = other.re_ * other.re_ - other.im_ * other.im_;
        if(ans.re_ % dv) return false;
        if(ans.im_ % dv) return false;
        return true;
    }

    Complex operator/(const Complex& other) const {
        Complex ans = *this * other.GetConjugate();
        int dv = other.re_ * other.re_ - other.im_ * other.im_;
        return Complex(ans.re_ / dv, ans.im_ / dv);
    }

    bool operator<(const Complex& other) const {
        if (re_ < other.GetRe()) {
            return true;
        }
        if (re_ > other.GetRe()) {
            return false;
        }
        return (im_ < other.GetIm());
    }
private:
    int re_, im_;
};

class Polynomial {
public:
    Polynomial(const vector<int>& v) : v_(v), sz_(v.size()) {}

    Complex calc(const Complex& x) const {
        Complex lst = Complex(v_[0], 0);
        for (int i = 1; i < sz_; ++ i) {
            lst = x * lst + Complex(v_[i], 0);
        }
        return lst;
    }
private:
    int sz_;
    vector<int> v_;
};

const int kReDelta = 1e3 + 7, kImDelta = 1e3 + 7;

int32_t main() {
    ios_base::sync_with_stdio(false);
    int n; cin >> n; ++ n;
    vector<int> v(n);
    F(i, n) cin >> v[i];
    set<Complex> ans;
    while(v[0] == 0) {
        ans.insert(Complex(0, 0));
        vector<int> d;
        for(int i = 1; i < v.size(); ++ i) d.push_back(v[i]);
        v = d;
    }
    n = v.size();
    reverse(v.begin(), v.end());
    Polynomial pol(v);

    for (int re = -kReDelta; re <= kReDelta; ++ re) {
        for (int im = -kImDelta; im <= kImDelta; ++ im) {
            Complex cur = Complex(re, im);
            Complex com = pol.calc(cur);
            if (com.IsNull()) {
                ans.insert(cur);
            }
        }
    }
    Complex u = Complex(v[v.size() - 1], 0) / Complex(v[0], 0);
    for (auto com : ans) {
        //cout << "idx" << idx << ' ' << u.ToString() << ' ' << ans[idx].ToString() << endl;
        if (!u.CavDivide(com)) {
            u = Complex(1, 0);
            break;
        }
        u = u / com;
    }
    if (pol.calc(u).IsNull()) ans.insert(u);
    Complex oth = Complex(-u.GetRe(), -u.GetIm());
    if (pol.calc(oth).IsNull()) ans.insert(oth);

    cout << ans.size() << endl;
    for(auto com : ans) {
        cout << com.ToString() << ' ';
    }
}