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#include <iostream>
#include <cstdint>
#include <vector>
#include <algorithm>
#include <iterator>
#include <string>


using namespace std;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n;
    cin>>n;

    string s;
    s.reserve(n+1);

    cin>>s;
    int counter = 0;
    for (auto c: s ){
        if (c=='1') counter++;
    }

    if ( (n*3 <=counter) && (counter<=n*6 ) ){

        for (;n>0; n--){
            int delta = counter - n*3;
            switch(delta){
            case 0: cout<<'a';
                counter-=3;
                break;
            case 1: cout<<'c';
                counter-=4;
                break;
            case 2: cout<<'g';
                counter-=5;
                break;
            default: cout<<'w';
                counter-=6;
            }

        }
        cout<<endl;
    }else{
        cout<<"NIE"<<endl;
    }

    return 0;
}