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#include<iostream>

#define rep(a,b) for(int a=0; a<(b); ++a)
#define nl "\n"

using namespace std;

int n,counter=0;
char letters[]={0,0,0,'a','f','k','w'};

int main()
{
	cin>>n;
	string s;
	cin>>s;
	for(auto i:s){
		counter+=i-'0';
	}
	int d = counter/n;
	int r = counter%n;
	//clog<<d<<" "<<r<<nl;
	if(counter<n*3||counter>n*6){
		cout<<"NIE"<<nl;
		return 0;
	}
	rep(i,n-r){
		cout<<letters[d];
	}
	rep(i,r){
		cout<<letters[d+1];
	}
	cout<<nl;
	return 0;
}