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