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