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#include <iostream>
using namespace std;

int main(){
  char C[]={'0','0','0','a','c','g','w'};
  int x;
  string S;
  cin>>x;
  cin>>S;
  int l=S.size();
  int b1=0;
  int b1min=3*l/8;
  int b1max=6*l/8;
  int n1,n2,w;
  for (int i=0;i<l;i++){
    if(S[i]=='1')b1++;
  }   
  if(b1>=b1min && b1<=b1max){
      n1=b1/(l/8);
      n2=b1-n1*(l/8);
      for(int i=0;i<l/8;i++){
         w=n1;
         if (n2>0){
           n2--;
           w++;
         }
         cout<<C[w];
      }
      cout<<endl;
      return 0;
  }
  cout<<"NIE"<<endl;
  return 0;
}