#include <bits/stdc++.h>
using namespace std;
int a1, a2, b1, b2, c1, c2;
int main() {
  scanf("%d %d %d %d %d %d", &a1, &b1, &c1, &a2, &b2, &c2);
  if ((a1 == 0 && b1 == 0 && c1 != 0) || (a2 == 0 && b2 == 0 && c2 != 0)) {
    printf("0\n");
    return 0;
  }
  if ((a1 == 0 && b1 == 0 && c1 == 0) || (a2 == 0 && b2 == 0 && c2 == 0)) {
    printf("-1\n");
    return 0;
  }
  if (b1 == 0 && b2 == 0) {
    if (c1 * a2 == c2 * a1) {
      printf("-1\n");
      return 0;
    }
    printf("0\n");
    return 0;
  }
  if (a1 == 0 && a2 == 0) {
    if (c1 * b2 == c2 * b1) {
      printf("-1\n");
      return 0;
    }
    printf("0\n");
    return 0;
  }
  if (a1 * b2 != a2 * b1) {
    printf("1\n");
    return 0;
  }
  if (c1 * b2 == c2 * b1) {
    printf("-1\n");
    return 0;
  }
  printf("0\n");
  return 0;
}
