#include <bits/stdc++.h>
using namespace std;
int main() {
  int a1, b1, c1;
  int a2, b2, c2;
  cin >> a1 >> b1 >> c1 >> a2 >> b2 >> c2;
  int d1, d2, d;
  if ((a1 == 0 && b1 == 0 && c1 != 0) || (a2 == 0 && b2 == 0 && c2 != 0)) {
    cout << 0 << endl;
    return 0;
  }
  d = a1 * b2 - a2 * b1;
  d1 = a1 * c2 - a2 * c1;
  d2 = b1 * c2 - b2 * c1;
  if (d != 0)
    cout << 1 << endl;
  else if (d1 != 0 || d2 != 0)
    cout << 0 << endl;
  else
    cout << -1 << endl;
}
