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