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