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#include <cstdio>

int n;
char s[4000003];

const char p[8] = {0, 0, 0, 'a', 'c', 'g', 'o', 0};

int main() {
  scanf("%d%s", &n, s);
  int ones = 0;
  for (int i = 0; i < 8 * n; i++) {
    if (s[i] == '1') ones++;
  }
  if (ones < 3 * n || ones > 6 * n) {
    printf("NIE\n");
    return 0;
  }
  while (n) {
    int w = ones / n;
    ones -= w;
    n--;
    printf("%c", p[w]);
  }
  printf("\n");
  return 0;
}