#include<iostream>
#include<cstdio>
using namespace std;
//int a[100]={3,3,4,3,4,4,5,3,4,4,5,4,5,6,3,4,5,4,5,5,6,4,5,5};
//int b[101]={5,5,4,5,4,4,3,5,4,4,3,4,3,2,5,4,3,4,3,3,2,4,3,3};
int main(){
	int n,i=0,j=0;
	cin>>n;
	for(int q=1;q<=n*8;q++){
		char a;
		cin>>a;
		if(a=='1')i++;
		else j++;
	}
	int aa;
	aa=abs(i-j)/4;
	if(i-j>=0&&(i-j-aa*4)%2==0&&(i-j-aa*4)/2+aa<=n){
		for(int q=1;q<=aa;q++)putchar('n');
		for(int q=1;q<=(i-j-aa*4)/2;q++)putchar('j');
		for(int q=1;q<=n-(i-j-aa*4)/2-aa;q++)putchar('c');
	}
	else if(j-i>0&&(j-i-aa*4)%2==0&&(j-i-aa*4)/2+aa<=n){
		for(int q=1;q<=aa;q++)putchar('w');
		for(int q=1;q<=(j-i-aa*4)/2;q++)putchar('a');
		for(int q=1;q<=n-(j-i-aa*4)/2-aa;q++)putchar('c');
	}
	else{
		cout<<"NIE";
	}
	return 0;
}

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