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