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