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#include <iostream>

using namespace std;

int main()
{
   string s;
   int n;
   int j = 0;
   cin >> n;
   cin >> s;
   for(int i = 0; i < 8*n; i++)
   {
      if(s[i] == '1')j++;
   }
   if(j < 3 * n)
   {
      cout << "NIE";
      return 0;
   }
   if(j > 6 * n)
   {
      cout << "NIE";
      return 0;
   }
   int r = j % n;
   int dz = j / n;
   for(int i = 0; i < n; i++)
   {
      int dod = 0;
      if(r > 0)
      {
         dod++;
         r--;
      }
      if(dz + dod == 3)cout << "a";
      if(dz + dod == 4)cout << "c";
      if(dz + dod == 5)cout << "g";
      if(dz + dod == 6)cout << "p";
   }
}