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