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//Wojciech Filipek
#include "bits/stdc++.h"
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int n;
    cin >> n;
    string bajty;
    cin >> bajty;

    int jeden = 0;
    int zero = 0;

    int a, b, c, d;
    a = 0;
    b = 0;
    c = 0;
    d = 0;

    for(int i = 0; i < bajty.length(); i++){
        if(bajty[i] == '1')
            jeden++;
        else
            zero++;
    }
    //cout << "jeden: " << jeden << endl;
    //cout << "zero: " << zero << endl;
    if(jeden/n < 3 || zero/n < 2 || (zero+jeden)%8 != 0){
        cout << "NIE" << endl;
    }
    else{
        if(jeden > zero){
            if(jeden/n == 6){
                d = n;
            }
            else if(jeden/n == 5){
                c = n;
                d = jeden - 5*n;
                c = n-d;
            }
            else if(jeden/n == 4){
                b = n;
                c = jeden - 4*n;
                b = n-c;
            }
            else if(jeden/n == 3){
                a = n;
                b = jeden - 3*n;
                a = n-b;
            }
        }
        else if(jeden < zero){
            if(jeden/n == 6){
                d = n;
                c = 6*n - jeden;
                d = n-c;
            }
            else if(jeden/n == 5){
                c = n;
                b = 5*n - jeden;
                c = n-b;
            }
            else if(jeden == 3*n){
                a = n;
            }
            else{
                b = n;
                a = 4*n - jeden;
                b = n-a;
            }
        }
        else
            b = n;

        jeden = 0;
        zero = 0;
        for(int i = 0; i < a; i++){
            cout << "a";
            jeden += 3;
            zero += 5;
        }
        for(int i = 0; i < b; i++){
            cout << "c";
            jeden += 4;
            zero += 4;
        }
        for(int i = 0; i < c; i++){
            cout << "g";
            jeden += 5;
            zero += 3;
        }
        for(int i = 0; i < d; i++){
            cout << "w";
            jeden += 6;
            zero += 2;
        }
        //cout << endl;
        //cout << "Jeden: " << jeden << endl;
        //cout << "Zero: " << zero << endl;
    }
}