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#include <cstdio>
#include <iostream>
#include <string>

using namespace std;

int $[7];

int main() {
  *($+3) = 0x61;
  *($+4) = 0x63;
  *($+5) = 0x67;
  *($+6) = 0x6f;

  int n;
  string s;
  scanf("%d", &n);
  cin >> s;

  int $1 = 0;
  for (int i = 0; i < 8 * n; i++) {
    if (s[i] == '1') $1++;
  }
  $1 -= 3 * n;

  if ($1 < 0 || $1 > 3 * n) {
    puts("NIE");
    return 0;
  }

  int d = $1 / 3, m = $1 % 3;
  for (int i = 0; i < d; i++) printf("%c", *($+6));
  if (d < n) printf("%c", *($+m+3));
  for (int i = d + 1; i < n; i++) printf("%c", *($+3));
  puts("");
}