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#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> PII;
typedef pair<ll, ll> PLL;
typedef pair<ld, ld> PLD;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<PII> VII;
typedef vector<VI> VVI;
typedef vector<VL> VVL;
typedef vector<VII> VVII;
typedef vector<PLL> VLL;
typedef vector<VLL> VVLL;
typedef vector<VI> VVI;
typedef vector<VL> VVL;
typedef vector<bool> VB;

template <class T, class G>
ostream &operator<<(ostream &os, const pair<T, G> &para) {
  os << para.first << " " << para.second;
  return os;
}
template <class T> ostream &operator<<(ostream &os, const vector<T> &vec) {
  for (const T &el : vec)
    os << el << " ";
  return os;
}
template <class T> ostream &operator<<(ostream &os, const set<T> &vec) {
  for (const T &el : vec)
    os << el << " ";
  return os;
}

#define REP(i, j) for (int i = 0; i < j; i++)
#define REP1(i, j) for (int i = 1; i < j; i++)
#define FOREACH(el, n) for (auto &el : n)
#define LAST(x) (x[(int)x.size() - 1])
#define pb push_back
#define pf push_front
#define st first
#define nd second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sp ' '
#define ent '\n'

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);

  int t = 1;
  // cin >> t;
  while (t--) {
    int n;
    string s;
    cin >> n >> s;
    int ones = count(all(s), '1');
    int zeros = 8 * n - ones;
    if (zeros > 5 * n || zeros < 2 * n) {
      cout << "NIE";
      return 0;
    }
    string temp = "";
    REP(i, n) {
      int diff = ones - zeros;
      if (diff >= 4) {
        temp += 'w';
        ones -= 6;
        zeros -= 2;
      } else if (diff >= 2) {
        temp += 'v';
        ones -= 5;
        zeros -= 3;
      } else if (diff >= 0) {
        temp += 'c';
        ones -= 4;
        zeros -= 4;
      } else if (diff < 0) {
        temp += 'a';
        ones -= 3;
        zeros -= 5;
      } else {
        cout << "NIE";
        return 0;
      }
    }
    cout << temp;
  }

  return 0;
}