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#include <bits/stdc++.h>
#define int long long
#define mp make_pair
#define pb push_back
#define ld long double
#define pii pair<int,int>
#define sz(x) (int)x.size()
#define piii pair<pii,pii>
#define precise cout<<fixed<<setprecision(10)
#define st first
#define nd second
#define ins insert
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;

int32_t main(){
  BOOST;
  int n;
  cin>>n;
  string s;
  cin>>s;
  int ones=0;
  for (auto it:s){
		ones+=(it=='1');
  }	
  if (ones<3 || n*6<ones || n*3>ones){
		cout<<"NIE";
		return 0;
  }
  string ans="";
  for (int i=1;i<=n;i++){
		if (i==n){
			assert(ones>=3 && ones<=6);
			if (ones==3)ans+='a';
			else if (ones==4)ans+='c';
			else if (ones==5)ans+='k';
			else ans+='w';
		}
		else{
			if (ones-3-(n-i)*6<=0)ans+='a',ones-=3;
			else ans+='w',ones-=6;
		}
  }
  assert(sz(ans)==n);
  cout<<ans;
  return 0; 
}