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#include <bits/stdc++.h>
using namespace std;

int main() {
   //freopen("in/1.in", "r", stdin);
   ios_base::sync_with_stdio(0);
   cin.tie(0);

   int n;
   cin >> n;
   string s;
   cin >> s;

   int ones = 0;
   for (auto& c : s) {
      if (c == '1') {
         ones++;
      }
   }

   map<int, char> letter = {{3, 'a'}, {4, 'c'}, {5, 'g'}, {6, 'o'}};

   int d = ones / n;
   if ((d < 3) || (d > 6) || ((d == 6) && ((ones % n) != 0))) {
      cout << "NIE";
   } else {
      while (n > 0) {
         d = ones / n;
         cout << letter[d];
         ones -= d;
         n -= 1;
      }
   }
}