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