#include <bits/stdc++.h>
using namespace std;
int main() {
  int a1, b1, c1, a2, b2, c2;
  int i, j, k;
  double m1, m2;
  cin >> a1 >> b1 >> c1 >> a2 >> b2 >> c2;
  if (a1 == 0 && b1 == 0 && c1 != 0)
    cout << "0";
  else if (a2 == 0 && b2 == 0 && c2 != 0)
    cout << "0";
  else if (a2 == 0 && b2 == 0 && c2 == 0)
    cout << "-1";
  else if (a1 == 0 && b1 == 0 && c1 == 0)
    cout << "-1";
  else {
    double det;
    det = a1 * b2 - a2 * b1;
    if (det == 0) {
      if (b1 * c2 - c1 * b2 == 0 && a2 * c1 - a1 * c2 == 0)
        cout << "-1";
      else
        cout << "0";
    } else
      cout << "1";
  }
  return 0;
}
