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