#include <stdio.h>
#include <stdlib.h>

#define MAX 21

int main(int argc, char **argv) {
  int n;
  scanf("%d", &n);
  int matrix[MAX][MAX];
  int i, j, k;
  while (n != -1) {
    for (i = 0; i < n; i++) {
      for (j = 0; j < n; j++) {
        scanf("%d", &matrix[i][j]);
      }
    }
    int weak[MAX];
    for (i = 0; i < n; i++) {
      weak[i] = 1;
    }
    for (i = 0; i < n; i++) {
      for (j = 0; j < n; j++) {
        for (k = 0; k < n; k++) {
          if (matrix[i][j] && matrix[j][k] && matrix[k][i]) {
            weak[i] = 0;
            weak[j] = 0;
            weak[k] = 0;
          }
        }
      }
    }
    for (i = 0; i < n; i++) {
      if (weak[i]) {
        printf("%d ", i);
      }
    }
    printf("\n");
    scanf("%d", &n);
  }
}