#include <bits/stdc++.h>
using namespace std;
int main() {
  double a1, b1, c1, a2, b2, c2;
  cin >> a1 >> b1 >> c1 >> a2 >> b2 >> c2;
  if (!a1 && !b1 && c1 || !a2 && !b2 && c2)
    cout << 0 << endl;
  else if (a1 * b2 != a2 * b1)
    cout << 1 << endl;
  else if (a1 * b2 == a2 * b1 && c1 * b2 == c2 * b1 && a1 * c2 == a2 * c1)
    cout << -1 << endl;
  else
    cout << 0 << endl;
  return 0;
}
