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#include <iostream>

using namespace std;

bool isValid(int n, int one){//n to ilość znaków
	if(n==0 && one==0) return true;
	return (3*n<8*one && 6*n>one*8);
}

bool generate(int one, int n, string &odp){ // n to ilość bloków
	for(int i=0;i<n;i++){
		//cout<<"n"<<n<<" one"<<one<<endl;
		
		if(isValid(8*(n-1-i),one-3)){
			odp+="a";
			one-=3;
			continue;
		}
		if(isValid(8*(n-1-i),one-4)){
			odp+="c";
			one-=4;
			continue;
		}
		if(isValid(8*(n-1-i),one-5)){
			odp+="g";
			one-=5;
			continue;
		}
		if(isValid(8*(n-1-i),one-6)){
			odp+="w";
			one-=6;
			continue;
		}
		
		return false;
	}
	return true;
}

int main(){
	int n,ones=0,zero=0;
	cin>>n;
	string temp;
	cin>>temp;
	for(char c : temp){
		if(c=='1')
			ones++;
		else
			zero++;
	}
	string odp="";
	if(generate(ones,n,odp))
		cout<<odp<<endl;
	else
		cout<<"NIE"<<endl;
	return 0;
}