#include <bits/stdc++.h>
using namespace std;
int main() {
  int cod = 5;
  int a1, b1, c1, a2, b2, c2;
  cin >> a1 >> b1 >> c1;
  cin >> a2 >> b2 >> c2;
  if (a1 == 0 && a2 == 0 && b1 == 0 && b2 == 0) {
    if (c1 == 0 && c2 == 0)
      cout << -1 << endl;
    else
      cout << 0 << endl;
    return 0;
  }
  if (a1 * b2 == a2 * b1) {
    if ((a1 * c2 == a2 * c1 && b1 * c2 == b2 * c1))
      cout << -1;
    else
      cout << 0 << endl;
  } else
    cout << 1 << endl;
  return 0;
}
