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#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(0);
  map<int, char> M = {{-2, 'a'}, {0, 'c'}, {2, 'g'}, {4, 'o'}}; 
  int n; cin >> n;
  string s; cin >> s;
  int cnt = -2 * count(s.begin(), s.end(), '0') + 8*n;
  string res;
  while (n--) {
    int delta = clamp(cnt, -2, 4);
    cnt-=delta;
    res+=(M[delta]);
  }
  if (cnt) {
    cout << "NIE\n";
  } else {
    cout << res << '\n';;
  }
  return 0;
}