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