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#include <bits/stdc++.h>

using namespace std;

int n;
string s;
int one, all;
int mina, maxa;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cin >> n >> s;
  all = 8 * n;
  mina = 3 * n;
  maxa = 6 * n;
  for (int i = 0; i < all; i++) {
    if (s[i] == '1') {
      one++;
    }
  }


  if (one < mina || one > maxa) {
    cout << "NIE";
    return 0;
  }
  while (all > 0) {
    if (one - 3 <= maxa - 6) {
      cout << "a";
      one -= 3;
      maxa -= 6;
      mina -= 3;
      all -= 8;
    }
    else {
      break;
    }
  }
  while (all > 0) {
    if (one - 6 >= mina - 3) {
      cout << "w";
      one -= 6;
      maxa -= 6;
      mina -= 3;
      all -= 8;
    }
    else {
      break;
    }
  }
  if (one == 4) {
    cout << "j";
  }
  if (one == 5) {
    cout << "y";
  }
}