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