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