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