#include <bits/stdc++.h>
using namespace std;
void itval(istream_iterator<string> it) {}
template <typename T, typename... Args>
void itval(istream_iterator<string> it, T a, Args... args) {
  cerr << *it << " = " << a << endl;
  itval(++it, args...);
}
const long long int MOD = 1e9 + 7;
template <typename T>
inline void print(T x) {
  cout << x << "\n";
}
template <typename T>
inline void printvec(T x) {
  for (auto a : x) cout << a << ' ';
  cout << '\n';
}
struct custom {
  bool operator()(const pair<pair<long long int, long long int>,
                             pair<long long int, long long int> > &p1,
                  const pair<pair<long long int, long long int>,
                             pair<long long int, long long int> > &p2) const {
    pair<long long int, long long int> p = p1.first, q = p2.first;
    return p.first * q.second > p.second * q.first;
  }
};
long long int get_pow(long long int a, long long int b, long long int M = MOD) {
  long long int res = 1;
  while (b) {
    if (b & 1) res = (res * a) % M;
    a = (a * a) % M;
    b >>= 1;
  }
  return res;
}
const long long int N = 1e5 + 5, inf = 2e18;
void solve() {
  long long int a1, a2, b1, b2, c2, c1;
  cin >> a1 >> b1 >> c1;
  cin >> a2 >> b2 >> c2;
  if (a1 == 0 && b1 == 0) {
    if (c1 != 0) {
      cout << 0 << '\n';
      return;
    }
    if (a2 == 0 && b2 == 0) {
      if (c2 != 0) {
        cout << "0\n";
        return;
      }
    }
    cout << "-1\n";
    return;
  }
  if (a2 == 0 && b2 == 0) {
    if (c2 != 0)
      cout << 0 << '\n';
    else
      cout << "-1\n";
    return;
  }
  if (a1 * b2 == a2 * b1) {
    if (c2 * b1 == b2 * c1 && a1 * c2 == a2 * c1) {
      cout << "-1\n";
      return;
    }
    cout << 0 << '\n';
    return;
  }
  cout << "1\n";
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  int test = 1;
  clock_t z = clock();
  for (long long int tes = (long long int)0; tes < (long long int)(test);
       tes++) {
    solve();
  }
  fprintf(stderr, "Total Time:%.4f\n", (double)(clock() - z) / CLOCKS_PER_SEC),
      fflush(stderr);
  return 0;
}
