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