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#include <bits/stdc++.h>

using namespace std;

const int MAXN = 1e5;
int DP[MAXN];
int wybor[MAXN];
int monety[] = {3, 4, 5, 6};


int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    int ileJeden = 0;
    char x;
    cin >> n;
    for(int i = 0; i < 8*n; i++){
        cin >> x;
        if(x == '1'){
            ileJeden++;
        }
    }
    //cout << ileJeden << "\n";
    int minimum = 0;
    int ind = 0;
    int k = 4;
    for(int i = 0; i <= ileJeden; i++){
        wybor[i] = -1;
    }
    for(int i = 1; i <= ileJeden; i++){
        minimum = ileJeden+1;
        for(int j = 0; j < k; j++){
            if(i-monety[j] >= 0){
                if(minimum > DP[i-monety[j]]+1){
                    minimum = DP[i-monety[j]]+1;
                    ind = j;
                }
            }
        }
        DP[i] = minimum;
        wybor[i] = ind;
    }
    if(DP[ileJeden] > ileJeden || DP[ileJeden] < 0){
        cout << "NIE\n";
        return 0;
    }
    //odzyskiwanie
    vector<int> znaki;
    int ile = 0;
    int ile6 = 0;
    while(ileJeden > 0){
        ile++;
        //cout << "x" << monety[wybor[ileJeden]] << "\n";
        if(monety[wybor[ileJeden]] == 6){
            ile6++;
        }else{
            znaki.push_back(monety[wybor[ileJeden]]);
        }
        ileJeden = ileJeden - monety[wybor[ileJeden]];
    }
    /*for(auto x: znaki){
        cout << x << " ";
    }
    cout << "\n" << ile << "\n";*/
    if(ile < n){
        while(ile6 > 0 && ile < n){
            ile++;
            ile6--;
            znaki.push_back(3);
            znaki.push_back(3);
        }
        if(ile != n){
            cout << "NIE\n";
            return 0;
        }
    }
    while(ile6 > 0){
        znaki.push_back(6);
        ile6--;
    }
    /*for(auto x: znaki){
        cout << x << " ";
    }
    cout << "\n";*/
    for(int i = 0; i < znaki.size(); i++){
        if(znaki[i] == 3){
            cout << "a";
        }
        if(znaki[i] == 4){
            cout << "c";
        }
        if(znaki[i] == 5){
            cout << "g";
        }
        if(znaki[i] == 6){
            cout << "o";
        }
    }
    cout << "\n";
}