#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;
    return 0;
  }
  if (a2 == 0 && b2 == 0 && c2 != 0) {
    cout << 0;
    return 0;
  }
  if (a1 * b2 - a2 * b1 != 0)
    cout << 1;
  else if (a1 * c2 - a2 * c1 == 0 && b1 * c2 - b2 * c1 == 0)
    cout << -1;
  else
    cout << 0;
  return 0;
}
