acmp.ru 257

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
vector <ll> s;

ll check(ll n, ll a, ll b, ll c, ll d){
    return (a*n*n*n+b*n*n+c*n+d);
}

void poisk(ll n, ll a, ll b, ll c, ll d){
    for (ll i = 1; i*i <= abs(n); i++){
        if (n % i == 0){
            if (check(i, a, b, c, d) == 0)
                s.push_back(i);
            if (check(n/i, a, b, c, d) == 0)
                s.push_back(n/i);
            if (check(-1*i, a, b, c, d) == 0)
                s.push_back(-1*i);
            if (check(-1*n/i, a, b, c, d) == 0)
                s.push_back(-1*n/i);
        }
    }
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    ll a, b, c, d;
    cin >> a >> b >> c >> d;
    if (a == 0 and b == 0 and c == 0 and d == 0){
        cout << -1;
        return 0;
    }
    if (a != 0 and b!=0 and c==0 and d==0 or a == 0 and b == 0 and c != 0 and d == 0 or a == 0 and b != 0 and c == 0 and d == 0 or a != 0 and b == 0 and c == 0 and d == 0 or a != 0 and b == 0 and c != 0 and d == 0 or a!= 0 and b!=0 and c!=0 and d==0)
        s.push_back(0);
    if (a == 0 and b != 0 and c != 0 and d == 0 or a != 0 and b == 0 and c != 0 and d == 0 or a!= 0 and b!=0 and c!=0 and d==0)
        poisk(c, a, b, c, d);
    if (a != 0 and b!=0 and c==0 and d==0)
        poisk(b, a, b, c, d);
    poisk(d, a, b, c, d);
    sort(s.begin(), s.end());
    s.erase((unique(s.begin(), s.end())), s.end());
    cout << s.size();
    for (ll i = 0; i < s.size(); i++)
        cout << " " << s[i];
    return 0;
}